All these changes will allow us to more easily add Lol Engine as a
submodule of another Git project.

There might be issues with lolremez but at first sight it seems to work.

If SDL_CFLAGS is defined to a non-empty value, even spaces, a later
test will wrongly succeed and think SDL_CFLAGS is a user override.

Since C++11 threads are available on every platform that has threads, we
no longer need our pthread implementation. The LOL_FEATURE_CXX11_THREADS
macro is gone, too, and we now just use LOL_FEATURE_THREADS.

Note that it is still necessary to link with -lpthread or -pthread on
some platforms, so we don’t throw that part away.

Disallow firing when no ammo is active, tweak laser position, get rid of
the old tileset, add a title screen.

My Ludum Dare 32 entry is now in the main games/ directory and is
called “Size-o-Tron 3000” because… because, that’s all.

This will be a 2D puzzle platformer. The theme this year is
“Unconventional Weapon”.

- removed 154050 CR characters
 - removed 150 trailing whitespaces
 - replaced 1695 tabs with spaces
 - fixed 1886 svn:eol-style properties

MeshViewer first pass

Add SafeEnum var in lua
MeshViewer SceneSetup is operational
Added imGui to vs-solution, not implemented yet