[feature] Better Error Display

[Vurv]

Is your feature request related to a problem? Please describe.
Depends on #10 being fixed.

Describe the solution you'd like
I'd like for error messages to be similar to Rust's errors, where the tokens are pointed out in a code block, and potentially there is a "fixed" code block right under.

E.g.

if (true) {

}

/*
	Warning:
		Redundant if statement:
			if (true)
			^^^^^^^^^ This will always run the if statement.
*/

Or an example from codespan