Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_vulkan.h
#	imgui.cpp

Added optional misc/stl/imgui_stl.h wrapper to use with STL types (e.g. InputText with std::string). (#2035, #2006, #1443, #1008)

InputText: callback InsertChars() support resize callbacks correctly (followup to 24ff259) + fixed demo to use those functions. (#2006, #1443, #1008).

InputText: Renamed ImGuiTextEditCallback to ImGuiInputTextCallback, ImGuiTextEditCallbackData to ImGuiInputTextCallbackData for consistency. Kept redirection types (will obsolete).

InputText: Internal renaming of some fields + final copy uses edit_state.CurLenA+1 instead of buf_size.

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_opengl2.cpp
#	examples/imgui_impl_opengl3.cpp
#	imgui.cpp

Use literals in place of LLONG_MIN, LLONG_MAX ULLONG_MAX if they are not available. Amend 498c0dc. We prefer using the defines if available in limits.h because they somehow tend to work without warnings when enabling strict C++03 compilation. The 3 literals are fallbacks.. (#1926).

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_dx11.cpp
#	examples/imgui_impl_glfw.cpp
#	examples/imgui_impl_sdl.cpp
#	imgui.cpp

Renamed io.OptResizeWindowsFromEdges to ConfigResizeWindowsFromEdges, io.OptCursorBlink to io.ConfigCursorBlink, io.OptMacOSXBehaviors to ConfigMacOSXBehaviors for consistency. (#1427, #1495, #822, #473, #650) ...

Demo: Exposed flags in Demo.

Demo: Fix using ambiguous InputFloat() call which redirect to obsolete version. (#1990)

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_opengl3.cpp
#	imgui.cpp

Fixes for pre-C++11 compilers. ...

That said, I think we can consider upgrading requirement to an early VS-friendly subset of C++11. The thing I would like the most from C++11 are forward-declared enum (from VS 2012 onward).

Visual Studio: calling into _vsnprintf. (#1085)

Demo: Added extra demo in the Basic Horizontal Layout section. (#1977) + PR guidelines

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_sdl.cpp
#	imgui.cpp

Changed ImGui::GetTime() return value from float to double to avoid accumulating floating point imprecisions over time.

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp

Viewport: Removed the need for the back-end to fill io.MousePosViewport, it seems unnecessary at this point. (#1542)

Demo: Clarified the use of IsItemHovered()/IsItemActive() right after being in the "Active, Focused, Hovered & Focused Tests" section. This will be of more importance with the introduction of tabs.

Merge branch 'master' into viewport ...

# Conflicts:
#	examples/imgui_impl_dx10.cpp
#	examples/imgui_impl_dx11.cpp
#	imgui_demo.cpp

Demo: Fixed spacing from b629f90 change.

Examples: Tweaked the main.cpp example structure for all examples. (There are a few hidden agendas here: 1) I would like to avoid encouraging people from using the implicit "Debug" window, and promote using Begin/End. In spite of my best attempt, there are a few feature of the upcoming docking system that cannot work 100% properly for the implicit Debug window, so future proof let's not put that feature in the spotlight too much for new users. 2) Moved dumb hardcoded positions into a single spot that can be replaced with a viewport relative position and not affect other demo windows. 3) Calling ShowDemoWindow before anything else, also for the benefit of a specific docking demo which will have an ordering constraint which is not really problematic in a real app but shouldn't be put forward in the demo.

Demo: Spacing.

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp
#	imgui_demo.cpp
#	imgui_internal.h

Demo: Re-ordered example app code to match their menu order and forward declaration order + added header to delimitate them.

Nav: Added a CTRL+TAB window list and changed the highlight system accordingly. (#787)

Nav: Added a CTRL+TAB window list and changed the highlight system accordingly. (#787)

Merge branch 'master' into viewport ...

# Conflicts:
#	imgui.cpp

Examples: Comments, Demo: Log early out, TODO. (#1553)

Demo: Added basic Drag and Drop demo. (#143, #1931)