Platform: Ensure classes match their header filename

Also drop some unused files.

Renamed:
- `platform/iphone/sem_iphone.h` -> `semaphore_iphone.h`
  (same for `osx`)
- `platform/uwp/gl_context_egl.h` -> `context_egl_uwp.h`
- in `platform/windows`: `context_gl_win.h`, `crash_handler_win.h`,
  `godot_win.cpp`, `joypad.h` and `key_mapping_win.h` all renamed to
  use `windows`. Some classes renamed accordingly too.
- `EditorExportAndroid` and `EditorExportUWP` renamed to
  `EditorExportPlatformAndroid` and `EditorExportPlatformUWP`
- `power_android` and `power_osx` renamed to `PowerAndroid` and
  `PowerOSX`
- `OSUWP` renamed to `OS_UWP`

Dropped:
- `platform/windows/ctxgl_procaddr.h`

platform/server/os_server.h

@@ -38,7 +38,7 @@
 #ifdef __APPLE__
 #include "platform/osx/crash_handler_osx.h"
 #include "platform/osx/power_osx.h"
-#include "platform/osx/sem_osx.h"
+#include "platform/osx/semaphore_osx.h"
 #else
 #include "platform/x11/crash_handler_x11.h"
 #include "platform/x11/power_x11.h"
@@ -69,7 +69,7 @@ class OS_Server : public OS_Unix {
 	InputDefault *input;
 
 #ifdef __APPLE__
-	power_osx *power_manager;
+	PowerOSX *power_manager;
 #else
 	PowerX11 *power_manager;
 #endif