Feature/rewrite csharp module

[TwoOfTwelve]

Refactored the c-sharp module to use the new framework for the listener as well as for the tests.

The token extraction rules have been modified as follows:

• every individual using directive results in one token (except those that look like type aliases. Not containing dots or containing generics)
• else results in an if token (like in java)
• all loops result in a loop_begin and loop_end token instead of a single token for each type of loop
• checked and unchecked blocks result in tokens
• namespaces are mapped into tokens
• Custom operator functions also create tokens now
• constructors and operators now get method_begin and method_end tokens for their bodies
• Local constants now result in a local_variable token
• Assigning operators like ++ or *= now create assign tokens akin to java

[sonarqubecloud]

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0 Bugs
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98.1% Coverage
0.0% Duplication