Major rework of envelope address handling: a normalized version of the envelope addresses is maintained in the message context and message context is now also available during action execution.

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

Introduced message context to give extensions the ability to associate context data with the currently processed message.

Added proper ATTR_FORMAT to all functions that accept a string format and fixed one bug in the process.

Exported sieve-code-dumper from sieve-interpreter containing all code dumping related implementation. Now to remove all printfs....

Grouped runtime parameters into a single runtime environment and started implementation of result composition/execution.