Fixed logging of mailbox names. It logged the converted mUTF7 version in stead of the original UTF8.

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

Properly implemented dumping a binary including a list of required extensions and support for extension-specific output.

Implemented support for overriding default argument implementations of number, string and string-list.

Implemented implicit keep to execute when not canceled or when the preceeding action execution fails.

Properly implemented the code dumper. Dumps are now printed in a stream. The individual opcode and operand implementations no longer use printf()s.

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