Lexer improvements:

- Convert unquoted idents to lowercase.
- Recognize quoted idents.
- Allow all unicode whitespace characters
- Added UnexpectedSymbol token for unexpected input (otherwise it is just ignored)
- Handle mixed case keywords in the lexer file instead of filtering the stream

pglablib/pglablib.pro

@@ -104,7 +104,6 @@ SOURCES += \
     catalog/PgSequenceContainer.cpp
 
 HEADERS += \
-    CaseChangingCharStream.h \
         Pglablib.h \
 	ASyncDBConnection.h \
 	ConnectionConfig.h \