FOGL-3176 Update the mathemtical expression toolkit to allow for (#1677)
FOGL-3176 Update the mathemtical expression toolkit to allow for (#1677)

escaping of special characters in symbols. Also move from each
individual library that uses it to a common location within the FogLAMP
core.
foglamp/FogLAMP,foglamp/FogLAMP,foglamp/FogLAMP,foglamp/FogLAMP