Usability

• Support line continuations - all function arguments shouldn't need to be on the same line.

• Reassigning a name with #set should raise a compiler error if it will get ignored anyway.

• Support not in.

Internationalization

• Support placeholder evaluation in $i18n() macros.

• Check in memtable (previously called xle).

• Build two implementations of the i18n macros. One using memtable and one using gettext.