Consider aligning with pre-defined token categories used in LSP/VS Code

[ftomassetti]

See https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_semanticTokens

	namespace = 'namespace',
	type = 'type',
	class = 'class',
	enum = 'enum',
	interface = 'interface',
	struct = 'struct',
	typeParameter = 'typeParameter',
	parameter = 'parameter',
	variable = 'variable',
	property = 'property',
	enumMember = 'enumMember',
	event = 'event',
	function = 'function',
	method = 'method',
	macro = 'macro',
	keyword = 'keyword',
	modifier = 'modifier',
	comment = 'comment',
	string = 'string',
	number = 'number',
	regexp = 'regexp',
	operator = 'operator',
	decorator = 'decorator'