Examples: SDL: Added .vcproj files.

Examples: SDL: Minor stylistic tweaks. Fixed handling of ImGuiMouseCursor_None so it doesn't underflow array. Fixed harmless uninitialized pointer. (#1626)

Renamed misleading ImGuiMouseCursor_Move to ImGuiMouseCursor_ResizeAll. SDL: Fixed cursor. (#1626)

Use SDL system cursors in SDL examples. (#1626) ...

(Squashed 4 commits)

Obsoleted the io.RenderDrawListsFn callback, you can call your graphics engine render function after ImGui::Render(). Use ImGui::GetDrawData() to retrieve the ImDrawData* to display..(#1599) ...

Examples: Updated examples.

Examples: Added Changelog to make updates easier.

Fixed GCC zealous warnings (#1623)

Plot: plot a flat line if scale_min==scale_max (#1621)

Updated to stb_truetype 1.19 (include minor fix for #1622)

Examples: SDL: Added Changelog at the top of the imgui_impl files. (#1618)

Update README.md

Comments, moved ImFontAtlas::Flags to "public" area.

ImFontAtlas: Added ImFontAtlasFlags_NoPowerOfTwoHeight, ImFontAtlasFlags_NoMouseCursors flags. (#1613)

Update .travis.yml

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Travis: testing without adding external apt repositories (which frequently fails), may be unnecessary today

Update README.md

ImFontAtlas: if stbtt_PackBegin() because of failing allocation we return a little more nicely. (keeps Coverity static analyzer happy!)

Update README.md

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Demo: Fonts; Added Font Offset.

Fixed legacy forward function IsRootWindowOrAnyChildHovered() broken by a63fbbc

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Update README.md

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Added sample gif, removed section about performances (unnecessary)

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