Allowing DeltaTime==0.0f to not assert

SDL example: tweaks and fixes.

Merge branch 'SampleSDL2' of https://github.com/CedricGuillemet/imgui into CedricGuillemet-SampleSDL2

Merge branch 'ios_example_merge'

iOS Example: Optimise PNG files size

iOS example: shallow tweaks and fixes (untested)

iOS example working based on modified OpenGL3 example + Synergy

Fixed ListBoxHeader() not honoring negative sizes the same way as BeginChild() or BeginChildFrame() (#263)

ImVector<> access to Size/Capacity/Data (#262)

Removed the majority of size_t from the code. ImVector<> now uses int. (#262) ...

May trigger new compilation warnings?

Fixed minor zealous Clang warning (demo code intentionally uses strdup() to be copiable)

ImVector<> cannot be re-defined (#262)

Optimisation, removed the duplicate ClipRectStack in ImGuiWindow, storing single value

ImDrawList store pointer to their owner name for easier auditing/debugging. Metrics windows render clip rectangle when hovering.

Removed obsolete GetDefaultFontData() function that would assert anyway (obsoleted 2015/01/11)

PlotLines(), PlotHistogram(): fixed incorrect hovering test (would trigger tooltip when menu is open)

Comments

MenuItem() can be activated on release (#245)

Fixed IsMouseDragging() (fix #260)

Added DragFloatRange2() DragIntRange2() helpers (#76)

Update README.md

Comments

Add conditional #ifdef prior to imconfig.h to facilitate inclusion in build systems (#255)

Fixed warnings for more pedantic settings (#258)

Added ImGuiKey_PageUp, ImGuiKey_PageDown for user.

Added GetKeyIndex() helper.

Tweaked scrolling example code (#150)

SetScrollFromCursorPos() -> SetScrollHere() (#150) final call !

Added SetScrollY(), SetScrollFromPosY(). Renamed SetScrollPosHere() to SetScrollFromCursorPos(). (#150)

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