Added new media icons for audio/video

Added icons new icons, deleted an old one.
Using new icons in AudioSlide/VideoSlide.

Closes #2304

src/org/thoughtcrime/securesms/util/ThemeUtil.java

@@ -0,0 +1,31 @@
+/**
+ * Copyright (C) 2015 Open Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.thoughtcrime.securesms.util;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.util.TypedValue;
+
+public class ThemeUtil {
+  public static Drawable resolveIcon(Context c, int iconAttr)
+  {
+    TypedValue out = new TypedValue();
+    c.getTheme().resolveAttribute(iconAttr, out, true);
+    return c.getResources().getDrawable(out.resourceId);
+  }
+}