Improve PSL directive, function, and variable name highlighting #789
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Improved the highlighting for PSL (Profile Scripting Language). This improves highlighting for numbers, variable names (which can start with . or %), various types of function calls, and language-specific directives.
The language documentation is not available to the public, so it's not easy to verify by non-FIS customers, but much of the highlighting is inspired by the grammar from FIS' PSL VS Code extension: https://github.com/ing-bank/vscode-psl.