WCPS ANTLR4 parsing error reporting enhancement

[Dimitar Misev]

I got these errors:

• A parsing error occurred at position=4:69. Offending symbol is=[@41,143:143=',',<14>,4:69]. Parser message=no viable alternative at input 'coveragehillShadeover$pxx(imageCrsDomain($c[E(1049795:1059795),N(7740205:7750205)]),

The problem is that the query fragment after input has all the spaces removed, which is confusing.

• A parsing error occurred at position=10:170. Offending symbol is=[@306,632:632=')',<70>,10:170]. Parser message=mismatched input ')' expecting {AND, ',', '/', '.', '=', '>', '>=', IS, '[', '<', '<=', '-', '*', '!=', OR, OVERLAY, '+', XOR}

The problem is that it is unclear what position=10:170 and Offending symbol is=[@306,632:632=')',<70>,10:170] mean.