ColorEdit4: Fixed broken tooltip on hovering the color button (actually fixes #373, #380)

Version number 1.47 WIP

Version 1.46

Fix to allow using SetNextWindow* functions with ImGuiSetCond_Appearing on modal windows (#377) ...

Also affect other popups which called FindBestPopupWindowPos() on their
second frame but it most often acts as a no-op but it wouldn't be
noticeable.

Tweaks (calling inner SetNext* functions directly from Begin)

Renamed Window LastFrameDrawn to LastFrameActive, more correct

ColorEdit4: hovering the color button shows correct alpha (fix #373)

ColorConvertFloat4ToU32() round the floats instead of truncating them.

InputText(): always use live input data for display in read-only mode (fix #360)

Scrollbar: background color less translucent in default style (flattened alpha) so it works better on non-WindowBg colored background.

Scrollbar: fixed vertical alignment with border + no menu bar (following #365)

InputText: removed the need for text_end pointer in the cursor position calculation loop, allows switching buffers

InputText: comments.

InputText: added comments and somehow clarified the optimized code that calculate text position + updated demo

Added items to Todo list

Added SetClipboardText / GetClipboardText helper shortcuts to match MemAlloc / MemFree

Added comments (#369 #370)

Fix for AltGR being send as Ctrl&Alt on german keyboards. Don't consume characters if CTRL key press is detected AND ALT key press is detected in Imgui::InputTextEx

Fixed bug with handling of malformed utf-8 at the end of a non-zero terminated string range.

Fixed mouse release double-triggering (#359, #362)

Scrollbar: fixed minor rendering offset when borders are enabled (fix #365)

Fixed IsKeyReleased() and IsMouseReleased() returning true on the first frame. ...

Loosely related to #362

BeginChildFrame() helper has the extra_flags parameter.

HoveredId is set via a SetHoveredID() function. Added HoveredIdAllowHoveringOthers not used by default API.

Dummy() create an item so functions such as IsItemHovered() can be used.

InputText: fixed crash when passing a buf_size==0 (which can be of use for read-only selectable text boxes) (#360)

Added ImGuiWindowFlags_NoBringToFrontOnFocus behavior.

Scrollbar: Tweaked scrollbar inner padding for small scrollbars.

Window: fixed window lower-right clipping limit so it plays more friendly with both OpenGL and DirectX coordinates. ...

Not sure about this. Hmm.

Scrollbar: tidying up (#355)