Show #include refcounts under -v
Report concatenation if done
Restore "parsing" messages (lost in previous restructuring)
Add indentation for error context, easier to read inside lots of output
Report more info about #includes when parsing (merged in or not) under -v
Use hDirExists() to determine whether cmdline arg is dir

instead of relying on the lack of file name extension.
Relax input file extension checks
Add -w and OPTION WHITESPACE, only preserve whitespace if they're given
emit: Don't emit fbc-style spaced parameter lists, be more standard instead
ast: Add pass to solve out __fbfrog_anon* struct ids if possible

and also make the temp it counter unique across files, so that there won't
be duplicate UDTs.
ast: Fix merging to allow GROUPs on both sides