Misc Fixes

==========

-NOTIFICATION_WM_QUIT fixed on android (seems tha way this is reported changed in newer sdk)
-WIP implementation of APK Expansion APIs for publishing games larger than 50mb in Play Store
-Feaures in the new tutorials are all present in the sourcecode
-This (hopefully) should get rid of the animation list order getting corrupted
-Improved 3D Scene Importer (Skeletons, Animations and other stuff were not being merged). Anything missing?
-In code editor, the automatic syntax checker will only use file_exists() to check preload() else it might freeze the editor too much while typing if the preload is a big resource
-Fixed bugs in PolygonPathFinder, stil pending to do a node and a demo

3d/platformer/engine.cfg

@@ -24,3 +24,5 @@ max_shadow_buffer_size=1024
 framebuffer_shrink=1
 shadow_filter=3
 debug_shadow_maps=false
+fp16_framebuffer=true
+debug_hdr=false