Generalizing Logic Data Structures

[Drodt]

Intended Change

This PR is the first step towards modularization of KeY to support target languages other than Java. We extract common data structures to ncore and took Feedback from the KaDa meetings into consideration. It does not break existing functionality and should be merged as otherwise maintaining a parallel version becomes difficult.

Type of pull request

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] Refactoring (behaviour should not change or only minimally change)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] There are changes to the (Java) code
• [ ] There are changes to the taclet rule base
• [ ] There are changes to the deployment/CI infrastructure (gradle, github, ...)
• [ ] Other:

Ensuring quality

• [x] I made sure that introduced/changed code is well documented (javadoc and inline comments).
• [x] I made sure that new/changed end-user features are well documented (https://github.com/KeYProject/key-docs).
• [ ] I added new test case(s) for new functionality.
• [ ] I have tested the feature as follows: ...
• [ ] I have checked that runtime performance has not deteriorated.

Additional information and contact(s)

Current developers not involved in modularization can continue as usual with the following restrictions:

1. Changes in ncore must be discussed with the core developers and inparticular @Drodt.
2. PRs with changes to de.uka.ilkd.logic.* should always add @Drodt as an additional reviewer.
3. Feedback is always welcome!

The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 55.43807% with 295 lines in your changes are missing coverage. Please review.

Project coverage is 37.85%. Comparing base (573c82c) to head (1256e74).

Files	Patch %	Lines
...c/main/java/de/uka/ilkd/key/logic/TermBuilder.java	48.21%	26 Missing and 3 partials :warning:
...rc/main/java/de/uka/ilkd/key/ldt/JavaDLTheory.java	51.16%	17 Missing and 4 partials :warning:
...java/de/uka/ilkd/key/logic/op/ModalOperatorSV.java	12.50%	21 Missing :warning:
...c/main/java/de/uka/ilkd/key/logic/op/Modality.java	66.66%	5 Missing and 10 partials :warning:
...ilkd/key/proof/init/FunctionalBlockContractPO.java	0.00%	13 Missing :warning:
.../ilkd/key/proof/init/FunctionalLoopContractPO.java	0.00%	12 Missing :warning:
.../src/main/java/de/uka/ilkd/key/logic/TermImpl.java	73.80%	1 Missing and 10 partials :warning:
.../main/java/de/uka/ilkd/key/java/TypeConverter.java	23.07%	10 Missing :warning:
...kd/key/informationflow/po/InfFlowProofSymbols.java	0.00%	7 Missing :warning:
...ilkd/key/informationflow/proof/init/StateVars.java	0.00%	7 Missing :warning:
... and 63 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3357 +/- ## ============================================ - Coverage 37.91% 37.85% -0.07% + Complexity 17069 17042 -27 ============================================ Files 2076 2082 +6 Lines 127020 127290 +270 Branches 21388 21441 +53 ============================================ + Hits 48165 48183 +18 - Misses 72949 73194 +245 - Partials 5906 5913 +7 ```

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