Collapsing header also honor FrameRounding

Examples: Added a color slider for the background color + tweak first example use of button.s

ColorEdit3: clicking on color square change edit-mode, removing color-edit mode button by default.

Added FrameRounding setting (default to 0 for now).

Fixed TooltipBg color not being honored by tooltip + no minimum tooltip size.

Fix missing glyph handling in modified stb_truetype.h (ttf branch)

Fix stupid crash on fallback glyph handling (ttf branch)

TODO list update

TODO list update

Improve memory reserve policy for Clipboard/ImGuiBuffer

Fixed logging to clipboard on architectures where va_list are modified by vsnprintf (fixed #112)

Warning fixes for llvm windows 64-bits

Fixed ImGuiTextBuffer::empty() to ignore the enforced zero-terminator ...

+ removed unnecessary destructor

Fixed style.WindowMinSize not honored properly.

Fix missing glyph handling in modified stb_truetype.h

Typos and comments

Fixed temporary glyph rectangle allocation using size much too big.

Tweak default texture width for large amount of characters.

Documentation on new font / texture get api

ImFont::GetTextureData API allow to retrieve 8/32 bits data + lazily load defaults font ...

Examples: OpenGL3 and DirectX11 back to using 32-bits texture solely for
ease of integration.

Mde it optional to new() io.Font - however it stills needs to be loaded.

Examples' Says "OpenGL2" vs "OpenGL3" in title bar.

TAB to spaces

Speculative fix for warnings for GCC/Clang

Examples: all supports TextureID in renderer, added LoadFontTexture() function.

ImDrawList::AddText() allows changing font

Added first-pass of Image() based on #73 + demo

ImVector: less hoops in back() / front(), more friendly for debugger and unoptimized builds ...

+ fixed typos

Fixed GetStyleColName() not matching the enum strings for 3 values (#111)

Build fix for GCC/Clang, cannot foward declare a static array?