Simplified ImDrawList system (samples are 20 lines shorter) + merged title bar draw bar.

Fixed warnings for more stringent compilation settings. Added various small helpers.

Missing assert + comments

Tweaked checkbox/radio default hover color to be less distracting. Added GetItemWidth(). Added text filter to style editor.

Added ImGuiCol_CheckHovered to show hovered checkboxes and radio buttons

Commented samples and shuffled bits of the initialisation based on user's feedback.

Added PixelCenterOffset for OpenGL/DirectX compatibility.

Initial release