use internal emoji pane for all android versions

1) Enter key by default (remove as option), still
   keeping "Enter key sends" option

2) New material assets for emoji and keyboard icons,
   inc a xxhdpi version finally

fixes #2300, fixes #2251, fixes #2183

Closes #2302

// FREEBIE

res/layout/conversation_activity.xml

@@ -86,9 +86,12 @@
                         android:autoText="true"
                         android:capitalize="sentences"
                         android:background="@drawable/compose_background"
+                        android:paddingTop="12dp"
+                        android:paddingBottom="12dp"
                         android:paddingRight="0dp"
+                        android:paddingLeft="0dp"
                         android:imeOptions="actionSend|flagNoEnterAction|flagNoExtractUi"
-                        android:inputType="textShortMessage|textAutoCorrect|textCapSentences|textMultiLine"
+                        android:inputType="textAutoCorrect|textCapSentences"
                         android:maxLength="2000"
                         android:maxLines="4"
                         android:nextFocusForward="@+id/send_button"

res/values/themes.xml

@@ -48,8 +48,8 @@
         <item name="conversation_transport_sms_indicator">@drawable/ic_send_sms_insecure</item>
         <item name="conversation_transport_push_indicator">@drawable/ic_send_push</item>
         <item name="conversation_transport_popup_background">@color/white</item>
-        <item name="conversation_emoji_toggle">@drawable/ic_emoji_dark</item>
-        <item name="conversation_keyboard_toggle">@drawable/ic_ime_dark</item>
+        <item name="conversation_emoji_toggle">@drawable/ic_mood_grey600_24dp</item>
+        <item name="conversation_keyboard_toggle">@drawable/ic_keyboard_grey600_24dp</item>
         <item name="conversation_attach_file">@drawable/ic_attach_file_light</item>
         <item name="conversation_attach_image">@drawable/ic_image_light</item>
         <item name="conversation_attach_video">@drawable/ic_movie_creation_light</item>
@@ -185,8 +185,8 @@
         <item name="conversation_transport_sms_indicator">@drawable/ic_send_sms_insecure_dark</item>
         <item name="conversation_transport_push_indicator">@drawable/ic_send_push</item>
         <item name="conversation_transport_popup_background">@color/black</item>
-        <item name="conversation_emoji_toggle">@drawable/ic_emoji_light</item>
-        <item name="conversation_keyboard_toggle">@drawable/ic_ime_light</item>
+        <item name="conversation_emoji_toggle">@drawable/ic_mood_white_24dp</item>
+        <item name="conversation_keyboard_toggle">@drawable/ic_keyboard_white_24dp</item>
         <item name="conversation_attach_file">@drawable/ic_attach_file_dark</item>
         <item name="conversation_attach_image">@drawable/ic_image_dark</item>
         <item name="conversation_attach_video">@drawable/ic_movie_creation_dark</item>

res/xml/preferences_advanced.xml

@@ -6,16 +6,10 @@
                         android:title="@string/preferences__textsecure_messages"
                         android:summary="@string/preferences__use_the_data_channel_for_communication_with_other_textsecure_users"/>
 
-    <CheckBoxPreference android:defaultValue="false"
-                        android:key="pref_enter_key"
-                        android:title="@string/preferences__enable_enter_key_title"
-                        android:summary="@string/preferences__replace_smiley_with_enter_key"/>
-
     <CheckBoxPreference android:defaultValue="false"
                         android:key="pref_enter_sends"
                         android:summary="@string/preferences__pressing_the_enter_key_will_send_text_messages"
-                        android:title="@string/preferences__pref_enter_sends_title"
-                        android:dependency="pref_enter_key"/>
+                        android:title="@string/preferences__pref_enter_sends_title"/>
 
     <Preference android:key="pref_choose_identity"
                 android:title="@string/preferences__choose_identity"

src/org/thoughtcrime/securesms/ConversationActivity.java

@@ -674,10 +674,12 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
   }
 
   private void initializeIme() {
-    if (TextSecurePreferences.isEnterImeKeyEnabled(this)) {
-      composeText.setInputType(composeText.getInputType() & (~InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE));
+    if (TextSecurePreferences.isEnterSendsEnabled(this)) {
+      composeText.setInputType (composeText.getInputType()  & ~InputType.TYPE_TEXT_FLAG_MULTI_LINE);
+      composeText.setImeOptions(composeText.getImeOptions() & ~EditorInfo.IME_FLAG_NO_ENTER_ACTION);
     } else {
-      composeText.setInputType(composeText.getInputType() | (InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE));
+      composeText.setInputType (composeText.getInputType()  | InputType.TYPE_TEXT_FLAG_MULTI_LINE);
+      composeText.setImeOptions(composeText.getImeOptions() | EditorInfo.IME_FLAG_NO_ENTER_ACTION);
     }
   }
 
@@ -688,10 +690,6 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     emojiDrawer    = Optional.absent();
     emojiToggle    = (EmojiToggle) findViewById(R.id.emoji_toggle);
 
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-      emojiToggle.setVisibility(View.GONE);
-    }
-
     attachmentAdapter = new AttachmentTypeSelectorAdapter(this);
     attachmentManager = new AttachmentManager(this, this);
 
@@ -1130,7 +1128,6 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
       if (actionId == EditorInfo.IME_ACTION_SEND) {
         sendButton.performClick();
-        composeText.clearFocus();
         return true;
       }
       return false;