Optimise variable system

[DieserMerlin]

Variable names should ignore non-alphanumeric chars (They should fit into a sentence like "$sender, you are amazing" instead of "$sender , you are amazing").

They also don't parse args correctly: (name [arg1, arg2, ...])

Input	Parsed to (currently)	Parsed to (should)	Reason
$hello(world,123)	hello ['world', '123']	hello ['world', '123']	Alright
$hello(world, 123)	hello ['world']	hello ['world', '123']	Whitespace behind 'world,'
$hello(world,123	hello ['world', '123']	hello ['world', '123']	Parameter list is unclosed (dirty and error prone)

To prevent unexpected behavior they should have a smarter system that searches the closing bracket (if it has brackets, irrelevant if it hasn't) and automatically remove whitespaces between arguments.

They also need a system to prevent double variable registration.

[DieserMerlin]

Variables should also be nestable

[DieserMerlin]

https://github.com/Twasi/twasi-core/commit/283c30e82e19bf0906cab01676eeec56e177f8f4