Improve parameter type matching regex
Improve parameter type matching regex

Fixes (again) #657 as well as issues brought up in #670.

- Corrects the order of type, template arguments, nullable type specification and array specifications.
- Ensures array specification support all forms (simple arrays, multi-dimensional arrays, arrays of arrays).
seraku24/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,OmniSharp/omnisharp-vscode,seraku24/omnisharp-vscode,OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode