Warning fixes (fix #118)

Enabled us to create the internal state on client side allocated memory, e.g. a heap

Fixed pointer dereferencing error from merge

Merge branch 'master' of https://github.com/ocornut/imgui

Added a way to replace the internal state pointer so that we can optionally share it between modules (e.g. multiple DLLs)

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Web: update picture.

Removed the dependency on realloc functionality

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Web: Redone one screenshot so it fits in github website without resizing

New set of pictures!

Shortened text

InputText: process character input before Return because they may come together (IME batch)

Examples: DirectX11: fixed handling of unicode character inputs.

Wrapping g.ActiveId assignment into a function for easy breakpoint.

Pedantic grammar fix

Examples: DirectX11: increasing vertex buffer size (would really need a dynamic buffer size) ...

+ Delete unused code

Examples: changed default background color.

Version change

Embedded a mouse cursor that can be drawn for you by setting io.MouseDrawCursor

ImColor::HSV() helper + color buttons demo

Added ImColor() inline helper. Image/ImageButton() now takes ImVec4 for consistency and honor window alpha.

Exposed ColorConvertHSVtoRGB, ColorConvertRGBtoHSV, ColorConvertFloat4ToU32

Added ImageButton() using regular framing + override framing size (#73)

ImDrawList::AddCallback() allows for custom rendering (e.g. 3D scene inside a imgui widget))

ShowTestWindow() early out if window is collapsed. Drawing the 2 columns example differently.

Added ImDrawList::SplitDrawCmd() to force multiple draw calls for depending rendering/blending + Comments

ImFontAtlas::Build() does a sanity memset on glyph rectangles.

Examples: fixed custom rendering example canvas size.

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