Addendum to #2635. Add support for multi-viewports in SDL+DX!! example. making all Win32-centric back-ends handle PlatformHandleRaw. Using the field to use/store the HWND for internal purpose in SDL/GLFW back-ends. (#1542)

Viewport: Added PlatformHandleRaw. Update SDL+DX11 example. (#1542, #2635)

Restore SLN which in Docking branch includes more projects.

Merge branch 'master' into docking ...

# Conflicts:
#	docs/CHANGELOG.txt

Word-wrapping: Fixed overzealous word-wrapping when glyph edge lands exactly on the limit. Because of this, auto-fitting exactly unwrapped text would make it wrap. (fixes initial 1.15 commit, 78645a7d).

Examples: SDL+DX11: Changelog, readme, batch files, fixed vcxproj, minor stylistic fixes + minor sync of other main.cpp files. (#2632)

Implement SDL/dx11 sample

Window: Fixed InnerClipRect right-most coordinates using wrong padding setting (introduced in 1.71).

Fiedx OpenGL ES 3.0 include for iOS and tvOS (#2631)

Updated Ogre bindings (#2619) ...

And support python

Internals: Columns: Poke into WorkRect and use them in the GetContentRegionMax() functions. This should be a no-op, but preparing us to transition toward using WorkRect instead of ContentRegionRect. ...

Removed one use of ContentsRegionRect.

Disable -Wpragmas warning in GCC to avoid relying on version checks, as unusual/forks/mods don't appear to always have same warning<>version. (#2618) ...

+ Fix version number in imgui.h

Fix monitor dpi info not being copied to main viewport when multi-viewports are not enabled. (#2621, #1676) + Tweaks, short path in FindPlatformMonitorForRect().

Merge branch 'master' into docking ...

# Conflicts:
#	docs/CHANGELOG.txt
#	imgui.cpp
#	imgui.h

ImDrawList: Fixed CloneOutput() helper crashing. Also removed unnecessary risk from ImDrawList::Clear(), draw lists are being clear before use each frame anyway. (#1860)

ImDrawList::ChannelsSplit(), ImDrawListSlitter: Fixed an issue with merging draw commands between channels 0 and 1. (#2624) Introduced by cef88f6.

Removed redirecting functions/enums that were obsoleted in version 1.51 (June 2017): ImGuiCol_Column*, ImGuiSetCond_*, IsItemHoveredRect(), IsPosHoveringAnyWindow(), IsMouseHoveringAnyWindow(), IsMouseHoveringWindow(), IMGUI_ONCE_UPON_A_FRAME.

Version 1.72 WIP

Docking: Fixed rendering of outer decoration happening on non-visible docked window (#2623, #2109). Revealed by 0770449. We are actually better than before now, as previously those would get unnecessarily get rendered into a hidden draw list.

Merge branch 'master' into docking ...

# Conflicts:
#	docs/CHANGELOG.txt
#	examples/README.txt
#	imgui.cpp
#	imgui.h
#	imgui_internal.h
#	imgui_widgets.cpp

Version 1.71 + comments

Internals: Reworked RenderTextEllipsis() to satisfy what we need for table headers.

Readme, comments, dear imgui prefixes

CollapsingHeader: Minor fix to align right side of frames (which is extruded past the Work/Contents rect) with clipping rectangle.

Log/Capture: Fixed BeginTabItem() label not being included in a text log/capture. ...

Extracted tab rendering code into a RenderTextEllipsis() function.

ImDrawListSplitter: Don't merge draw commands when crossing a VtxOffset boundary + Renamed fields ImDrawChannels to consistently suggest those are internal structures.

ImDrawListSplitter: Fix idx offset when merging (cef88f6) (#2591)

Window: child windows outer decorations (e.g. scrollbar) are rendered as part of their parent window, avoiding the creation of an extraneous draw command. ...

+ Metrics: inverted color of clip rect vs vertices bounding box when hovering a draw command, so the color matches the per-vertex preview.

Internals: Added drawlist and color arg to RenderArrow(), RenderBullet(). Reordered args for RenderPixelEllipsis.

imgui-test: Added IMGUI_TEST_ENGINE_LOG macro to emit into test log from core or user land.