WIP: External tests

Some API changes and (upcoming) patches to automate the testing of Pd-l2ork externals.

"External tests" might be a bit of a misnomer as the tools should be usable for testing internal classes as well.

Ideally, the tests would do the following:

1. load all libs in the relevant libdir
2. fetch the list of new creator names that came from loading the libraries in the libdir
3. try to create an object using each new creator name (with required args if necessary-- unfortunately some externals fail)
4. for each successfully instantiated object, enumerate the methods and call each one with whatever args are required.
5. check the output against the output we saved from the previous release (of course this implies saving changed state in each release as necessary)
6. for each dsp method, output a single block of audio using [switch~] (probably want to check against known good state, too, but that may create a lot of state)
7. report any new method and new creators

The nice thing is that we can use a nonzero arg to "menuquit" in order to signal to CI that there was a failure in any of these steps.

This will allow us to more easily make changes to the codebase. Not only external libraries but also the build system and core, as any soft failures (of which there are many in the build system) that screw up something in an external lib will (eventually) trigger a hard failure in this test framework.

Difficulties

1. State-saving and other side-effect-based methods. For now we might have to exclude certain methods like "write" or "read" that are more difficult to test using such an automated framework.
2. "helper" creators and methods. Some objects have "proxy" objects with their own class names. However, I think such objects have their constructors disabled. It may be possible to add a check for that in [classinfo] and thus skip these. (Not sure what to do about "helper" methods, though.
3. Probably lots of other problems I'm not thinking of yet...

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• 49a66be1 - force all iemlib classes to create without args

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• dcd835da - use A_DEFSYM instead of A_SYMBOL in creation arguments
• 1d02d9af - force all unauthorized classes to instantiate with sane defaults (plus clear warning)

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• 33848796 - fix up wrong path name/order in linux_make
• 0fdd35c7 - switch lyonpotpourri submodule to gitlab mirror. This is needed to make some
• 756fbd5f - make classes instantiate with no arguments
• fab23d62 - add first draft of an external test suite

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• f2f04f3d - make all cyclone classes instantiate when no arguments are provided
• 7e3c3f7d - remove unnecessary pd files from fluid~
• d47295f5 - remove duplicated abstraction from non-default library
• f94ff9eb - use [output~] in fluid~ library, remove some aliased abstractions
• d6d32a03 - remove a bunch of state files that somehow got added to the repo at the outset
• d8dfb24e - triage iem16's lack of shared lib with statically declared copy/pasta functions

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• 82e7b757 - allow all iem_adaptfilt objects to load without arguments
• 533888d2 - allow all iem_ambi objects to instantiate without arguments

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• 13dc22ec - allow all bin_ambi objects to instantiate without any arguments

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• 3964dea2 - remove "matrix~" from iemmatrix to prevent nameclash with cyclone/matrix~
• 7cfac026 - allow class_addcreator to register an additional creator with the namespace prefix if one was used

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• 0fdcd2a4 - remove copies of mapping library abstractions from la-kitchen
• b02fceba - make mrpeach objects instantiate without arguments

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• fc0822a0 - allow iem_spec2 objects to instantiate without arguments

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• 86dae341 - remove nameclashing classes from non-default loaded abstraction libraries

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• f442a71d - port tof/imagebang and allow it to instantiate with no arguments
• 070594c4 - update external test script

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• 147ef8ae - fix typo

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• b3dda6b4 - remove line referencing non-existent help files

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• d4119d6a - remove references to helpers in fluid~ that got removed

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• 04ebaffd - intermediate state for the tests:
• 7bed56ec - make [declare -lib] handle absolute paths (and namespace-prefixed paths)…
• 91c256f4 - simplify external-tests.pd to only load and instantiate using absolute paths

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merged