Improve ExpressionStatement parsing, lower priority for ExprJavaCall/ExprCustomEventValue

[sovdeeth]

The ExpressionStatement syntaxes effectively tripled the parse time for every line, as they would match everything and complete the same parse, just to throw it away if it wasn't an ExprJavaCall. Instead, this uses a regex match and then manually parses it using only ExprJavaCall, significantly saving in wasted parse times.

Also, the ExpressionStatement, ExprJavaCall, and ExprCustomEventValue syntaxes have all had their priority reduced to nearly last, to help prevent extraneous parses.

Overall parse times see pretty significant improvements, from 56s to 14s, 20s to 13s, and 16s -> 4s.