New class CachedScriptableMask: like CachedScriptableImage, only containing an AlphaMask instead of an Image/Bitmap.
Use CachedScriptableMask for all masks.

TODO: This introduces some duplicate code in ValueViewers that could be fixed by moving mask to the Style base class.

Added split_text function, which is the 'opposite' of break_text;
Script code "f\n(stuff)" now parses as "f;stuff" instead of a function call, "f(stuff)";
Fixed bug in cursor movement, which caused the closing > of a tag at end of input to be overwritten.

Removing some vestigial "hpt.jpg" files.

Split random_select into random_select and random_select_many.

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Added parameter to ScriptValue::next to recieve the key of the item.
Finished Add Multiple Cards behaviour.