Contexts for If/Loops

[David Nolden]

I don't know how exactly it is handled in C++ atm, but those things should 
create own contexts.

Those should be of type DUContext::Other, not a new type, because every 
context that contains executable code(as opposed to only declarations, like a 
DUContext::Class), should be of type DUContext::Other. 

This is good for consistency, and I don't see a reason why we need a new 
context-type for this, it would only make coding more complicated, and the 
added information is not needed.

They can still be differentiated by giving them fitting identifiers.

greetings, David