Updated imports based on BEX refactoring

Updated BEX library to 0.13

Author: CodesAway

BEXCodeComparePlugin/src/info/codesaway/bex/compare/RangeComparatorBEX.java

@@ -49,7 +49,7 @@
 import info.codesaway.bex.diff.patience.PatienceDiff;
 import info.codesaway.bex.diff.substitution.SubstitutionType;
 import info.codesaway.bex.diff.substitution.java.EnhancedForLoopRefactoring;
-import info.codesaway.bex.matching.BEXString;
+import info.codesaway.bex.parsing.BEXString;
 import info.codesaway.bex.views.BEXView;
 import info.codesaway.eclipse.compare.internal.DocLineComparator;
 import info.codesaway.eclipse.compare.rangedifferencer.AbstractRangeDifferenceFactory;