Extend current implementation of the Soot framework

[sdibernardo]

Based on #67: Extend the current implementation of the Soot framework for scanning process variables to dynamically scan call hierarchies within the "execute" method.

[sdibernardo]

After a quick wrap up about the inner workings of the current state of the analysis, it became clear that the block by block analysis (method body against method body) works fine so far. But to sharpen the analysis, a statement by statement analysis inside of blocks has to be conducted as well.

Next steps:

• [x] - Implement a statement by statement analysis inside a block
• [x] - Extend the mapping to find Camunda methods that manipulate variables
• [x] - Resolve endless loop problem that occurs while scanning method call hierarchy within same class

[sdibernardo]

• [x] - Extend search for "notify"-method

[Phorv01]

• [x] - Pass found anomalies inside one JavaDelegate to IssueWriter
• [x] - Anonymous inner classes overriding interface methods currently not recognized

[sdibernardo]

• [x] Add test cases