Bugfixes for Functions 'times' and 'or' in lang Package

[Darkfrobozz]

This update fixes bugs in the lang package.

The optimisation over Times expressions ignores errors: commented out these cases.
The optimisation over Or expressions uses the wrong data structure to match against, which can cause a crash: changed data structure to Seq.

Test Results Before Changes

[info] Run completed in 4 minutes, 38 seconds.
[info] Total number of tests run: 126
[info] Suites: completed 4, aborted 2
[info] Tests: succeeded 126, failed 0, canceled 0, ignored 0, pending 0
[info] *** 2 SUITES ABORTED ***
[error] Error: Total 97, Failed 0, Errors 2, Passed 95
[error] Error during tests:
[error]         regression.AbsErrorAnalysisRegressionTest
[error]         regression.PowTransformerRegressionTest
[error] (Test / test) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 284 s (04:44), completed Jun 19, 2025 3:16:17 PM

Test Results After Changes

[info] ScalaTest
[info] Run completed in 4 minutes, 40 seconds.
[info] Total number of tests run: 126
[info] Suites: completed 4, aborted 2
[info] Tests: succeeded 126, failed 0, canceled 0, ignored 0, pending 0
[info] *** 2 SUITES ABORTED ***
[error] Error: Total 97, Failed 0, Errors 2, Passed 95
[error] Error during tests:
[error]         regression.AbsErrorAnalysisRegressionTest
[error]         regression.PowTransformerRegressionTest
[error] (Test / test) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 286 s (04:46), completed Jun 19, 2025 3:24:32 PM