Changes

Now that we have ReservedVariable and subclasses modeling what self,
super and thisContext are named, we do not need to hardcode any of thas
info in the Name Analyzer.
- this unifies how Reserved Variables are looked up and defined. They
are now all defined in the InstanceScope.
- simplify the code, remove hardcoded 'self' 'super' 'thisContext'
OCAbstractMethodScope has still the unused var, this can not be changed
in the runnning system and will be done directly as a code change on the
repository later.

Now that we have ReservedVariable and subclasses modeling what self,
super and thisContext are named, we do not need to hardcode any of thas
info in the Name Analyzer.
- this unifies how Reserved Variables are looked up and defined. They
are now all defined in the InstanceScope.
- simplify the code, remove hardcoded 'self' 'super' 'thisContext'
OCAbstractMethodScope has still the unused var, this can not be changed
in the runnning system and will be done directly as a code change on the
repository later.