Support calling super method and constructor

In general, it should be possible to call:

for methods: their super implementation, e.g., super.foo()
for constructors:
- the super constructor, e.g., super()
- another constructor of the same class, e.g., this()

While 1. is already somewhat possible, the code generator does not add super. in front of the call. I think in the GUI the way it should be shown is that when the signature of a message points to a super class of the type of the lifeline (for self messages), it should indicate visually that it is a super call. This way, generating code is feasible.

For 2. it is currently not possible to select any other constructors. Visually, the same applies as above. Also, it should be ensured that these calls occur at the very beginning of the constructor definition (as per Java language specification).

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