update generated parser for Java properties with latest ANTLR runtime version

[martinlippert]

This error message appears in the log when opening an application.properties file:
ANTLR Tool version 4.5.3 used for code generation does not match the current runtime version 4.9.3

I think we need to re-generate the parser for Java properties with the ANTLR version that we use in the dependencies, which seems to be 4.9.3.

[BoykoAlex]

@martinlippert I had an idea of switching to OR Properties parser and AST.

[martinlippert]

What will be the difference? I haven't looked into the details yet, but re-using a properties parser sounds like a good idea instead of keeping our own up-to-date. But we should make sure that the switch to a new parser doesn't affect the coding experience here. I have things like fault-tolerant parsing in mind here. WDYT?

[BoykoAlex]

Fixed with 39de9aa
Rewrite parser rather than our own is moved to: #949