Used the same mask also for TextStyles.
To keep the text selectable (since the mask is now also used for containsPoint), the future sight cost masks needed to be updated.

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.