Fix issues relating to SDL and wxWidgets interaction in Atlas.

This fixes the transfer of key inputs from WxWidgets to SDL, making it
possible to type in the in-game GUI from Atlas.

Also fixes whitespace issues in some Atlas files.

The following improvements are OSX specific:
- fixes an SDL assertion related to unused subsystems in Atlas.
- Remove the 'osxguiapplication' override. This fixes the editor
starting up in the background and not accepting input when launched from
in-game.
- To prevent an issue with sdl/wxwidgets conflict when running from
inside the game, actually boot a new instance (see #2427)


Reported by: wik (Many thanks for your investigations)
Tested by: trompetin17, Stan
Fixes #2427
Fixes #2846

Differential Revision: https://code.wildfiregames.com/D2788
This was SVN commit r23926.

source/main.cpp

@@ -86,6 +86,10 @@ that of Atlas depending on commandline parameters.
 #include <unistd.h> // geteuid
 #endif // OS_UNIX
 
+#if OS_MACOSX
+#include "lib/sysdep/os/osx/osx_atlas.h"
+#endif
+
 #if MSC_VERSION
 #include <process.h>
 #define getpid _getpid // Use the non-deprecated function name
@@ -719,8 +723,13 @@ static void RunGameOrAtlas(int argc, const char* argv[])
 
 	} while (g_Shutdown == ShutdownType::Restart);
 
+#if OS_MACOSX
+	if (g_Shutdown == ShutdownType::RestartAsAtlas)
+		startNewAtlasProcess();
+#else
 	if (g_Shutdown == ShutdownType::RestartAsAtlas)
 		ATLAS_RunIfOnCmdLine(args, true);
+#endif
 
 	CXeromyces::Terminate();
 }