Requirement for inlined parselets

[phorward]

#105 establishes generic parselets and already integrates the feature very close into the language.

Due the removal of the ImlOp::Repeat-construct, Tokay became much slower than before, as more iterations and contexts are created during parsing than before. This reveals the need for parselets being compiled inline. At least, the result should become similar to the code generated by the ImlOp::Repeat-construct before, but as a feature of the Tokay language itself, applicable to any parselet.

This issue currently is only a reminder, but requires action soon.