Minor comment (#439)

Examples: OpenGL: Tentative fix for miscaled call to glViewport on high-DPI screens (#441) ...

Fix for 980ca28

Fix for popups being incorrectly positioned if their contents are larger than display and WindowPadding < DisplaySafeAreaPadding

stb_rect_pack.h update to 0.08

ImDrawList: Simplified code and added check to avoid mis-recycling a callback command.

ImDrawList: Fixed bug with PopClipRect() sometimes altering TextureId + fixed merging of draw calls with same TextureId

TreeNode(): Fixed horizontal spacing for layout to match Bullet() (followup to #414, #282)

Bullet(), BulletText(): vertical and horizontal alignment fixes (namely for widget sized line height). (followup to #414, #282)

TreeNode() fixed alignment of collapse arrow to it matches bullet (broken in 4006fb7)

Added ProgressBar() (#333)

GetColorU32: Comments

Added GetColorU32 helpers (previously internal and misplaced as window->Color())

Comments and missing forward declaration

ImColor: Added SetHSV helper function.

Ensure that individual widgets are pixel aligned when using non pixel snapped font rendering.

Demo: Display extra info from ImFontConfig in the font display

MenuBar clipping rectangle fix for bordered mode

Various adjustment for border to be inside instead of outside the window size

Demo: Tweak window option and style display

Demo: Added style editor in demo menu + exposed WindowFillAlphaDefault

Fixed SizeContents and auto-fit size not being rounded to integer, which affects border rendering when using non-default font

Added ImGuiIO::ClearInputCharacters() superfluous helper.

InputText: update mouse drag on mouse move only & key input reposition selection bounds (better fix for #429)

InputText: when keys are being input while mouse is dragging, disable mouse drag until button release (#429)

Examples: Fixed msvc batch files from warning.

Metrics: computing drawcmd bounding box handle case where buffer has been de-indexed.

Minor tidying up of now redundant code

Renamed Color() helpers to ValueColor() - dangerously named, rarely used and probably to be made obsolete.

Added SetItemAllowOverlap() exposed in imgui_internal.h only

Merge branch 'JuJuBoSc-master'