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Remove sequent formula
Intended Change
This PR prepares the ground for generalizing proof and calculus structures. It removes the superfluous SequentFormula class, which is only a behaviorless container for a term. The class is a left-over from times when we had formulas with constraints on the sequent level
It depends on PR #3472 to be merged first as it is based on that branch
Plan
- [ ] Pass tests
- [ ] Code cleanup
Type of pull request
- Refactoring (behaviour should not change or only minimally change)
Ensuring quality
- [ ] I have tested the feature as follows: tests
- [ ] I have checked that runtime performance has not deteriorated.
The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.