This commit adds highlighting characters other than the first with red color helping to get immediate feedback of the syntax error.
This helps those who come from languagles like JS where single quotes also denote multi-character strings.
Adding highlighting for string interpolation inside double-quoted strings and character literals inside single-quotes.
Avoiding string interpolation in the form of $var as this is considered bad practice.
Updates to address these comments:
"I still dont quite see why we need to introduce all those options, especially with names that dont say anything about kotlin. I would expect a single kotlin_static_words option to be enough.
Similarly, a single highlighter should be enough here."
