Switch to using VS Code Semantic Tokens API for colorization

[Colengms]

VS Code is implementing an API for Semantic Colorization. microsoft/vscode#86415

Opening this issue to switching to using that instead of our own semantic colorization implementation.

Proposed mappings from our tokens to VS Code tokens:

Token	old TextMate Scope	new Token Type	standard/custom	new Token Modifier	Fallback
Class Template	entity.name.type.class.templated	templateType	custom		type
Enumerator	variable.other.enummember	enumMember	standard
Event (C++/CLI)	variable.other.event	event	standard		property
Function	entity.name.function	function	standard
Function Template	entity.name.function.templated	templateFunction	custom		function
Generic Type (C++/CLI)	entity.name.type.class.generic	genericType	custom		type
Global Variable	variable.other.global	variable	standard	global
Label	entity.name.label	label	standard
Local Variable	variable.other.local	variable	standard	local
Macro	entity.name.function.preprocessor	macro	standard
Member Field	variable.other.property	property	standard
Member Function	entity.name.function.member	member	standard
Namespace	entity.name.namespace	namespace	standard
New / Delete	keyword.operator.new	newOperator	custom		operator
Operator Overload Function	entity.name.function.operator	operatorOverload	custom		operator
Operator Overload Member	entity.name.function.operator.member	memberOperatorOverload	custom		operator
Parameter	variable.parameter	parameter	standard
Property (C++/CLI)	variable.other.property.cli	cliProperty	custom		property
Reference Type (C++/CLI)	entity.name.type.class.reference	referenceType	custom		type
Static Member Field	variable.other.property.static	property	standard	static
Static Member Function	entity.name.function.member.static	member	standard	static
Type	entity.name.type	type	standard
User-Defined Literal - Number	entity.name.operator.custom-literal.number	numberLiteral	custom		number
User-Defined Literal - Raw	entity.name.operator.custom-literal	customLiteral	custom
User-Defined Literal - String	entity.name.operator.custom-literal.string	stringLiteral	custom		string
Value Type (C++/CLI)	entity.name.type.class.value	valueType	custom		type