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Win2D-based code editor control for WinUI 3.

At this stage, this is only a proof of concept.I tried to porthttps://github.com/PavelTorgashov/FastColoredTextBox line by line which was a huge pain so I had to stop. The codebase is just too huge and hard to read.

I took some inspiration and created my own Win2d-based control. Feel free to contibute! Would be nice to have a fast full-featured text editor for WinAppSDK / MAUI!

Stuff that works:

• Text selection & beam placement (inputs: PointerPress & Up/Down/Left/Right keys)
• Basic text editing (char insertion, back key, delete key, enter key)
• Basic copy & paste logic
• Scrolling (vertical & horizontal)
• Text, FontSize, Theme and TabLength are two-way bindable DependencyProperties
• Proof-of-Concept syntax highlighting for ConTeXt as a static Language Definition within the Control
• Syntax highligting example for a Lua file in the TestApp
• Actions (right-click menu & KeyboardAccelerators)
• Middle-click scrolling
• Search and highlight
• Drag and drop
• Error/Warning/Message/SearchMatch markers on the line and on the vertical ScrollBar
• Recource-intensive work does not block the UI thread: Setting the Text, Pasting large chunks of Lines, Changing the Code Language

• Line wrapping
• Text folding
• Text-wide instead of line-wise regexing (respectively lexer states for multiline-comment handling)
• Incremental regexing when Text source changes (Regex and draw the VisibleLines immediately, then regex the rest in blocks)
• IntelliSense for commands and arguments
• Find and highlight matching bracket/parenthesis/braces pairs, auto-close pairs
• Generalize the syntax highlighting and IntelliSense for more (user-definable) languages
• Minimap
• Breakpoints and breakpoint line highlighting
• Word/Keyword/Variable highlighting
• Multi-cursor selection and editing