Examples: Possibly clarified the intent of imgui_impl_* files.

fix POSITION format (ImDrawVert::pos is 2D, not 4D) ...

the inputlayout incorrectly described the POSITION attribute as being
4D, while ImDrawVert::pos is 2D. This went unnoticed because the buffer
binding has a stride of sizeof(ImDrawVert) and the POSITION is treated
as a float2 in the vertex shader. If you switch POSITION to float4 in
the vertex shader (and actually use the z/w in the matrix
multiplication) then everything become wacky-looking since it's
interpreting the texture coordinates as z/w. On a similar note: It's
weird that the projection matrix takes z and w into consideration when
those don't exist in the shader due to positions being float2s.

Examples: comment on setting the RenderDrawListsFn function.

Examples: DirectX11: fixed vertex shader which breaks with VS2015 somehow (DX11 version?) (#313)

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)

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