AvalonEdit 5.0.1-pre

* License changed from LGPL to MIT * New Feature: Hide mouse cursor while typing (enabled by default) * New Feature: Highlight current line (disabled by default) * New Feature: Overstrike mode (disabled by default) * AvalonEdit now raises the WPF DataObject attached events on clipboard and drag'n'drop operations. * Encoding detection now distinguishes between UTF-8 with BOM and UTF-8 without BOM. This prevents AvalonEdit from adding the BOM to existing UTF-8 files. * Improved handling of grapheme clusters. A base character followed by a combining mark is now treated as a single character by the caret movement logic. * Added RichText, RichTextModel and RichTextColorizer. * Renamed the VB highlighting mode from "VBNET" to "VB" * Changed IHighlighter API in order to support SharpDevelop's semantic C# highlighter * The regex-based highlighting engine was moved into its own class (HighlightingEngine) to be separated from the state-tracking logic in DocumentHighlighter. * Add FileName property to TextDocument class. * DocumentChangeEventArgs.RemovedText/InsertedText are now of type ITextSource instead of string. * The error-tolerant XML parser included with AvalonEdit was removed. An improved version of this parser is part of the NRefactory 5 project. * Removed some obsolete APIs.