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

Examples: DirectX11: resizing buffers dynamically (#299)

Clear font texture view to ensure Release() doesn't get called twice

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

Removed the majority of size_t from the code. ImVector<> now uses int. (#262) ...

May trigger new compilation warnings?

AA branch: ImDrawList: rename commands to cmd_buffer ...

Not strictly necessary but while we're doing minor breakage let's do
them at all once.

AA branch: ImDrawCmd idx_count -> elem_count

AA branch: io.RenderDrawListsFn signature changed to take ImDrawData, neater and future proof breaking of the render API (#133 #254)

Examples: DirectX9: fixed size passed to vertex and index buffer Lock() + readjust default buffer sizes.

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

Added ImGuiKey_PageUp, ImGuiKey_PageDown for user.

Fixed warnings for 64-bits builds

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering ...

Conflicts:
	examples/directx11_example/imgui_impl_dx11.cpp

Examples: DirectX11: explicitly set rasterizer state.

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering ...

Conflicts:
	imgui.cpp
	imgui.h

ImFontAtlas: doesn't clear input data, left to the application. (#224)

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering

Examples: DirectX9/11: hide os curosr if ImGui is drawing it (#155)

Examples: DirectX9/11: Fixed key mapping for down arrow.

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering ...

Conflicts:
	examples/directx11_example/imgui_impl_dx11.cpp
	imgui.cpp

Examples: DirectX11: tidying up.

Merge remote-tracking branch 'origin' into 2015-04-indexed-rendering ...

Conflicts:
	examples/directx11_example/imgui_impl_dx11.cpp
	examples/opengl3_example/imgui_impl_glfw_gl3.cpp

Examples: DirectX11: Removed unnecessary vertices conversion and CUSTOMVERTEX types.

Indexed rendering. Not in main branch because breaks rendering code too much. Will merge in trunk along with more major graphics changes lat

Examples: DirectX9: fixed duplicate creation of vertex buffer. Size of static vertex buffer at top of the code.

Examples: Fixed Clang warnings in DirectX examples

Examples: MSVC: increase warning level from /W3 to /W4 for DirectX examples

Added io.KeyAlt + support in examples apps ...

Currently unused but supported by sample so that more people will have
it set up when menus needs them

Examples: reference implementations honors drawlist user callbacks.