-Fixed color issues with source files (particularly for C files with pceas/hucc)
-Improved tooltips to react to more symbols/labels in source files (asm or C)
-Fixed bug that caused opcode tooltips to appear in C source files
-For hucc, try to find symbols that start with an underscore as a fallback when the symbol is not found (C symbols are exported as their asm name, which has an underscore prefixed)
-Fix double-click on a label/symbol name in source view to navigate to that symbol/function/etc
Notes:
-Uses a copy of VirtualizingStackPanel (to include fixes done after preview6) + fix another issue in lists
-Fixes memory leaks when closing windows (by setting DataContext to null, etc.)
