Finish preprocessor. Now it correctly handles $IFDEF, $IFNDEF, $ELSE, $ENDIF and $DEFINE.
Still not enterprise level, as has some flaws, but is okay to process hedgewars sources.
this should fix the highlighting failz with non-lowercase player names like the one CheezeMonkey ran into.
there is a workaround: in the user dir put the playername in <playerNameWithCorrectCase>_highlight.txt
Added tag 0-9.17-release for
changeset 4670f003f91b