Slate TPanelChildren, TSlotlessChildren are no longer full-fledged arrays; removed any unused Array API.
Fixed up a lot of improper use cases.
This better encapsulates the action of adding/removing Slate Widgets from the runtime tree as a Slate Core concern.
Alows us to add parent pointers in the future with significantly less effort.
#codereview Wes.Hunt
#codereview Nick.Darnell
#codereview Matt.Kuhlendschmidt
#codereview Justin.Sargent
[CL 2234301 by Nick Atamas in Main branch]
Added new widget overlay system for graph panels, designed to allow more flexibilty than the current brush-only implementation. This requred a small refactor to avoid the assumption that all child widgets of an SNodePanel are SNodes (and because there is no usable RTTI present).
Added index widget overlay to BT graph nodes.
Added flag to parent nodes to allow us to change the appearance of child nodes when another child is hovered.
TTP# 339733 - Editor: Behaviour Tree: Add better execution order indicators
reviewed by Lukasz.Furman
[CL 2226658 by Thomas Sarkanen in Main branch]
#ttp 332013 - The scroll wheel doesnt work properly in the material editor when a large comment box is created
#ttp 339978 - Graph Editor's Zoom to Cursor is super weird (bad) compared to ortho viewport's (good)
#branch UE4
#proj Editor.GraphEditor
#reviewedby Max.Preussner
[CL 2136463 by Richard TalbotWatkin in Main branch]
* Paint is now the non-virtual entry point to OnPaint to support required pre/post functionality. Widgets override OnPaint as usual, but calls to tell a widget to paint should be "Paint" not "OnPaint".
* ArrangeChildren -> OnArrangeChildren. ArrangeChildren is now the non-virtual entry point for the same reason as Paint/OnPain.
* OnPaint and OnArrageChildren are now private so they are not accidentally called.
* Added Stats for Paint time and ArrangeChildren time.
#BUN
#codereview:nick.atamas,max.preussner
[CL 2086158 by Wes Hunt in Main branch]
#proj core
#branch UE4
#summary Rename Trunc, Round, Floor, Ceil to TruncToInt, RoundToInt, FloorToInt, CeilToInt. Added *ToFloat versions. Repeated for FGenericPlatformMath and all derived classes for all platforms wherever applicable. Corrected comment in Fractional and added Frac() which does HLSL-style fractional (x - floor(x)). Checked for compilation on all projects (with cooking levels wherever applicable). Didn't change Fractional to Frac, this will be done in second commit.
#codereview robert.manuszewski
[CL 2064306 by Mikolaj Sieluzycki in Main branch]
#TTP 314475 - k2: comment boxes within other comment boxes do not move if the outer most box is moved. Also, if two nested comment boxes are moved, the nodes within move 2x as much as they should (video)
#Branch UE4
#Proj GraphEditor, BehaviourTreeEditor
#Add SNodePanel::SNode::FNodeSet typedef for conveniance and clarity
#Change Changed SNodePanel::MoveTo to take an FNodeSet as an exclusion filter on the moved nodes, once moved nodes are appended into this set.
CodeReview Chris.Wood, Nick.Whiting
[CL 2064255 by Ben Cosh in Main branch]
