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....

The :flags tag introduced by the imapflags extension now attaches side-effects to the appropriate action commands.

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