Examples: DirectX9: Using SetCapture/ReleaseCapture to get correct behavior (#1375)

Fixed compilation for #1375 + coding style fixes.

Capture/release window in DX9 implementation ...

This helps a lot when the user drags a slider but carries the cursor offscreen before releasing the button - without the capturing, the slider will "stick" to the mouse cursor even after the button has been released. (This should generally be added to all Windows implementations - I won't mind doing it if you think it's a good idea.)

Nav/Examples: honoring the io.WantMoveMouse flag in most common examples (#323) ...

Missing support Vulkan (#549), Apple (#575, #247), SDL (#58, #356),
Allegro, Marmalade (#368, #375)

Examples: DirectX9/10/11: Comments

Examples: DirectX9: Clarified texture release code (#1163)

Examples: DirectX9: Explicitely setting viewport to match that other examples are doing (#937)

Examples: DirectX9-10-11: Only call Windows' SetCursor(NULL) when io.MouseDrawCursor is set (#585, #909)

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

Examples: DirectX9: Removing spaces (#663)

Example: DirectX9: Backup and restore all state

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

Examples: DirectX9: save/restore some more device state.

IO: Added "Super" keyboard modifiers (corresponding to Cmd on Mac and Windows key in theory although the later is hard to read) (#473) ...

NB: Value not used.

Trim trailing spaces

FAQ and comments about the use of ImTextureID (#562, #561, #521, #510, #497, #475 ...)

Examples: DirectX9: Wastefully use a RGBA8 texture for the font texture to make compability more evident with user's textures (#521)

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

NULL out font texture on invalidate ...

If this isn't done, NewFrame won't re-create the font.

Examples: Possibly clarified the intent of imgui_impl_* files.

Examples: comment on setting the RenderDrawListsFn function.

Examples: DX9, DX11: mapping missing middle mouse button.

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

Examples: DirectX11: resizing buffers dynamically (#299)

Examples: DirectX9: tweaks.

Examples: DirectX9: resizing vertex and index buffers dynamically (#299)

AA branch: Agressively renamed all fields of ImDrawList, ImDrawCmd, ImDrawData to match the rest of our coding convention (#133)

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

Conflicts:
	examples/directx11_example/imgui_impl_dx11.cpp
	examples/directx9_example/imgui_impl_dx9.cpp
	examples/opengl3_example/imgui_impl_glfw_gl3.cpp
	examples/opengl_example/imgui_impl_glfw.cpp
	imgui.cpp