Slate now has the concept of composite fonts and font families (via FCompositeFont and FTypeface). A composite font is a font that contains a default font family, as well as any number of sub-font families which should be used for a given set of character ranges. This change will greatly improve the localization support for fonts.
UFont assets can now use two forms of caching "offline" (which is the way they have always worked historically), and "runtime" (which utilizes the Slate font cache to cache glyphs on demand). These runtime cached UFont assets are now the only way to specify which font to use for a UMG widget, and address the previous issues about ensuring that the required font files were staged for your game.
The Slate font cache now works on FFontData instances, rather than filenames. This allows the UFont asset to embed a blob of TTF or OTF font data inside it, rather than require the fonts be loaded from files on disk.
The Canvas text renderer has been updated to support runtime cached UFont assets. This gives our legacy Canvas based tools the same improved font localization support as the rest of the Slate-based editor UI.
UFont asset creation has been changed to use runtime caching by default, and additionally, you can now import a TTF or OTF file via the Content Browser and it will automatically create a UFont asset. If you still want an offline cached UFont asset, you can just change the cache type in the font editor, and the usual font picker dialog will appear and allow you to generate a font texture atlas.
[CL 2342203 by Jamie Dale in Main branch]
* Moved Slate.h into SlateBasics.h and began shifting less commonly used headers into SlateExtras.h.
* Slate.h now simply includes SlateBasics.h and SlateExtras.h.
* Slate.h includes a deprecated warning now to indicate that SlateBasics.h + specific includes should be used instead.
* Moved dozens of inlined functions using Slate widgets into .cpp files to avoid header dependencies.
* All code samples now include SlateBasics.h and SlateExtras.h so future shifts will not break most those projects, but not trigger the deprecation warning of including Slate.h.
#BUN
[CL 2329610 by Wes Hunt in Main branch]
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]
