[Demo] Custom text items

[Sergey Tkachenko]

These demos show how to create a new item class for text items.
The demos require TRichView 19.2 or newer.

CustomTextItems.zip

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A custom text item class (TRVMyTextItemInfo) is implemented in CustomTextItem.pas.
It has several new properties: BorderWidth, BorderColor, AdditionalText.
The class implements saving and loading these properties in RVF.

There are two demos: one for TRichViewEdit, one for ScaleRichView.
These demos process OnDrawStyleText event to visualize BorderWidth and BorderColor properties.
(note: these properties are stored directly in an item, not in a text style)

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