Allow comparisons "=>" and "=<" (BlitzMax-like)

Edit: Pull request now also contains a test scenario for brl.audio ("wav" loading fails with current bcc-ng) 
= = =

Sorry for this "long" patch" - my geany removes unneeded whitespace in empty lines or at the end of lines...


I adjusted: 

parser.bmx: Type TParser - Method ParseCompareExpr
expr.bmx: Type TBinaryCompareExpr - Method Eval