Syntax Highlighting Improvements (#4740)

* Preliminary attempt at taking in colorization suggestions and addressing feedback (included a manual visual test)

* imrpoved approach (additive to refactor)

* tightening list() keywords and such + added tests for generator expression ending

* addressingfind_package_handle_standard_args() and find_package_check_version() colorization

* took in duplicated operator regex into shared conditionalOperators rule

* removed dead include escape from unquoted rule + comment

* changed out the scoped stuff so that we keep a unified rule as opposed to splitting off

* fixed the fetch content declare edge case

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Co-authored-by: Hannia Valera <[email protected]>

Author: hanniavalera

CHANGELOG.md

@@ -9,6 +9,7 @@ Features:
 - Add "Delete Cache, Reconfigure and Build" command that chains cache deletion, reconfiguration, and build into a single action. [#4723](https://github.com/microsoft/vscode-cmake-tools/pull/4723)
 
 Improvements:
+- Improve CMake syntax highlighting with command-scoped keyword rules, expanded variable recognition, and better generator-expression support. Remove obsolete deprecated-keyword entries that caused false positives on user-defined names. [#4709](https://github.com/microsoft/vscode-cmake-tools/issues/4709) [#4508](https://github.com/microsoft/vscode-cmake-tools/issues/4508) [#4613](https://github.com/microsoft/vscode-cmake-tools/issues/4613)
 - Add MSVC linker error problem matching to the Problems pane. [#4675](https://github.com/microsoft/vscode-cmake-tools/pull/4675) [@bradphelan](https://github.com/bradphelan)
 - Use environment variables from `cmake.environment` and `cmake.configureEnvironment` when expanding `$penv{}` macros in CMake Presets `include` paths. [#3578](https://github.com/microsoft/vscode-cmake-tools/issues/3578)
 - Allow preset modification commands to target CMakeUserPresets.json. The target file is determined by the focused editor, or by prompting the user when both files exist. [#4564](https://github.com/microsoft/vscode-cmake-tools/issues/4564)