Examples: OpenGL: Fix early return on zero-sized framebuffer breaking GL state (#486, #547)

Examples: OpenGL: skip rendering and calling glViewport() if we have a zero-fixed buffer (#486)

Examples: SDL/OpenGL: Tabs to spaces

Examples: OpenGL: Tentative fix for miscaled call to glViewport on high-DPI screens (#441) ...

Fix for 980ca28

Examples: Not clearing input data/tex data in atlas (will be required for dynamic atlas anyway). Effectively fix resizing in DX examples. ...

+ Standardized comments.

Examples: Header comments.

Examples: Header comments.

Examples: Clarified comments. Removed font merging example from comments.

fixed text referencing GLFW library in SDL examples

Tweak build batch files and readmes

Examples: Most examples apps detect if ImDrawIdx was changed to 32-bits instead of 16

Examples: OpenGL2/3: Save/setup/restore viewport as part of render function. Update SDL example to match GL2 one. (fix #392)

Examples: update all examples with same comment (#389)

Examples: Possibly clarified the intent of imgui_impl_* files.

Examples: comment on setting the RenderDrawListsFn function.

Examples: imgui_impl* functions declared with IMGUI_API to ease copy & pasting into projects using DLL

add mac os x build instructions for sdl_opengl_example

Minor Windows adjustments

Fixed documentation

Carriage return (#289)

Show SDL error message on init failure

Use ImGuiIO::AddInputCharactersUTF8() in SDL2 example ...

Now Unicode text input works in this example.

Fix SDL2-example for Linux ...

The header is called "SDL_opengl.h" - case matters on Linux.

The main() function must indeed be called main(), on Windows it'll be
renamed to SDL_main (for SDL2main.lib) by #define in SDL_main.h
(which is included by SDL.h)

I added an entry to the example's README that describes how to build
it on Linux.

Fonts: added Cousine-Regular.ttf

Examples: comments.

Merge remote-tracking branch 'origin' into 2015-03-antialiased-primitives

SDL example: tweaks (#233 #226)

SDL example: hasty readme.

SDL example: update for indexed rendering.

SDL example: more cleanup to match other examples (#233 #226)