Fix Mac OS X build and remove cruft from Makefile

Examples: OpenGL*: Savnig/restoring existing scissor rectangle for completeness (#807)

Examples: OpenGL3: Revert Makefile change for OSX for now (#812)

Examples: Accessing ImVector fields directly, feel less stl-ey and fix renderer side assert when render list only contains a callback (#810)

Correct name for linking opengl3_example ...

According to glfw offcial site, linking `libglfw.3.dylib` etc should
use `-lglfw`.

Changed this made the compilation on my Mac successfully.

fixed space issues

Fix Vulkan example for use when a depth buffer is active.

Fixed OpenGL error when calling Shutdown without calling NewFrame

Examples: Renaming opengl_example/ to opengl2_example/ for clarity (1/2 because git)

Examples: Renaming opengl_example/ to opengl2_example/ for clarity (1/2 because git)

Ignore list for Visual Studio

tabs to space, remove braces

maxImageCount may be 0; add missing sType; change to 1 push constant range

Fix compile warnings in SDL examples

Examples: SDL+OpenGL: explicitly setting GL_UNPACK_ROW_LENGTH to reduce issues because SDL changes it (#752)

Fix minor typo in examples/README.txt

Examples: DirectX9: Removing spaces (#663)

Example: DirectX9: Backup and restore all state

Examples; DirectX10/11: Added comments about removing dependency on d3dcompiler DLL (#638)

Examples: DirectX10: Apply depth-stencil state like DirectX11 example (#640, #636)

Examples: DirectX11: Fixed uninitialized fields. Disabling depth-write (#640, #636)

Examples: DirectX10, DirectX11: Removed seemingly unnecessary bunch of rasterizer state creation code.

Examples: DirectX11: Fixed handle leak + minor coding style fix for #640

DX11 example depth test

Examples: SDL: Fixed unused variable warning on non-Windows platforms (#626)

Fixed various Clang -Weverything warnings (#626)

Examples: DirectX9: Removed dependency on dxguid.lib + remainder of d3dx9.lib (#611)

Examples: DirectX9: Removed dependency on dx3x9 (remainder) (#611)

Examples: DirectX9: Removed dependency on dx3x9.h so it can be used in a DirectXMath.h only environment (#611)

Examples: OpenGL3: Saving/restoring glActiveTexture() state (#602)