QPID-4621: Arithmetic operations for C++ broker selectors
- Rearranged Syntax and parser to support arithmetic
- Implemented arithmetic syntax
- Implemented arithmetic operators
- Added some tests for arithmetic operations
- Added explicit lexical tokens for all the comparison and arithmetic operations
- Added the missing ',' token for us in the 'IN' comparison
- Rearranged the lexer so that everything is not uniformly inside the
  hand crafted state machine.
- Moved a bunch of testing code from the tokeniser to the unit test
  (much of this code might actually not be very useful anymore)

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1457912 13f79535-47bb-0310-9956-ffa450edef68