External apps (#1469)

* implemented external app build

* added some ui stuff for testing

* added pacman game

* wired key to pacman game

* fixed pacman drawing issue

* changed afsk rx app to be external

* fixed ui::NavigationView initialization for external apps

* refactoring

* refactoring

* moved m4 image to external app

* added script for external app deployment

* refactoring

* implemented dynamic app listing

* added color to app icon

* improved app loading

* added external apps to sd card content

* refactoring

* review findings

* typo

* review findings

* improved memory management of bitmaps

firmware/chibios-portapack/os/ports/GCC/ARMCMx/LPC43xx_M0/ld/LPC43xx_M0.ld

@@ -33,6 +33,9 @@ __ram_end__             = __ram_start__ + __ram_size__;
 
 ENTRY(ResetHandler)
 
+ /* external apps */
+INCLUDE external.ld
+
 SECTIONS
 {
     . = 0;
@@ -142,7 +145,7 @@ SECTIONS
         *(COMMON)
         . = ALIGN(4);
         PROVIDE(_bss_end = .);
-    } > ram    
+    } > ram
 }
 
 PROVIDE(end = .);