Indentation should be handled statement-wise

[CodeFloh]

We are currently looking at code lines to determine indentation rules. This is not good, since we need to consider the full statement including continuation lines. Currently, this creates the following issues in the presence of multiline statements:

• Keywords that increase indentation will sometimes not be recognized
• Some continuation lines may not be recognized as strings and therefore parts of strings are falsely recognized as keywords
• Indentation is increased too early (indentation change within multi-line statement instead of after)

[PaulOxxx1]

I second this issue, I had to fix a bunch of wrong indentations because of variables like type_of_element or something like that, because they contain the string type. This pretty much only appeared in line continuations.