Attempt to fix autocomplete for strings that start with "$"

[mcred]

Please review as I was not able to successfully build due to issue unrelated to this code

When typing out variables in the IDE that start with $, for example $clog, autocomplete will correctly suggest possibilities, but when replacing the variable it will not properly identify the start as $ and will replace the text creating a double first character: $$clog.

I was not able to get the IDE to build from the current code. IntelliJ was not happy with it and gave lots of errors when trying to build. A pom.xml or other build manifest would be helpful for this.

I did do some testing to compare Character.isLetterOrDigit to text.charAt(start) == '$' in the console:

String text = "$clog";
System.out.println(Character.isLetterOrDigit(text.charAt(0)));
System.out.println(text.charAt(0) == '$');

Defined field String text = "$clog"

System.out.println(Character.isLetterOrDigit(text.charAt(0)))
false

System.out.println(text.charAt(0) == '$')
true

Considering that there was already an exception for text that starts with _, I hope that an additional check for $ will fix this issue. If it will not, please reject this PR. I may have misunderstood why the additional check for _ is required.