Encoded-character: resolved error reporting issue, added some syntax error tests and fixed some parsing bugs in the process.

Envelope: <> return path now always matches as the empty string, regardless of the specified address part.

Disallowed extraction of key elements from key strings for match types for with that would not make sense.

Imapflags: resolved problem of hasflags encountering duplicate flags in flag lists contained in a variable.

Resolved code duplication among commands that use comparators and match-types and found problems in the imapflags extension in the process.

Significantly improved handling of old/corrupt binaries and revised matching implementation in the process.

Working towards improving the handling of currupt binaries: defined multiple exit codes for execution functions and defined trace macro for reporting binary corruptions.

Fixed code emission for extension-defined variables and removed hardcoded paths from include extension.