tests: make CoinTests selectable and observable

[tritao]

Add lightweight CoinTests command-line selection and progress reporting:

• --list
• --test NAME
• --filter TEXT
• --max-tests N
• [RUN]/[DONE] progress markers

This is standalone test infrastructure and is independent of the renderer stack.

[Lgt2x]

This is nice, I'm fine with this contribution, but I would prefer to wire Coin tests to Ctest instead of investing dev time into a custom test runner. ctest has these features integrated with -N -R etc. This way, we can also expose the COIN_BUILD_TEST option in FreeCAD and have them running in the test suite if we want to.

Also, there are many tests named initialize that could be prefixed.

[Lgt2x]

Running bin/CoinTests --max-tests 10 shows [RUN 1/325]. I would expect here for it to show [RUN 1/10], what do you think? Same for --filter.

[tritao]

This is nice, I'm fine with this contribution, but I would prefer to wire Coin tests to Ctest instead of investing dev time into a custom test runner.

Makes sense to me, I'll see about updating this to CTest.