DSE: Improve the Z3 solution model & state handling
- Inverse the return flag of the solveOptimize method.
- Directly transform the Z3 output model when it is returned.
- Cleanup the scattered Status handling of the ExplorationSolution.
Issue-Ref: 3738 Issue-Url: https://af3-developer.fortiss.org/issues/3738 Signed-off-by: Alexander Diewald diewald@fortiss.org