Inconsistency/duplication: SoftwareVersion and SoftwareVersions

[yarikoptic]

Came up while reviewing paper for BEP020 (atten @bids-standard/bep020), claude picked up inconsistency of having SoftwareVersion whenever BIDS has SoftwareVersions. Well - the surprise is that we have both! :-/

❯ git grep '\<SoftwareVersions\>'
src/CHANGES.md:-   Added `SoftwareVersions`.
src/modality-specific-files/magnetoencephalography.md:   "SoftwareVersions": "Acq 5.4.2-linux-20070507",
src/pregh-changes.md:-   Added `SoftwareVersions`.
src/schema/objects/metadata.yaml:SoftwareVersions:
src/schema/objects/metadata.yaml:  name: SoftwareVersions
src/schema/rules/sidecars/continuous.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/eeg.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/ieeg.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/meg.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/micr.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/motion.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/mri.yaml:    SoftwareVersions:
src/schema/rules/sidecars/mrs.yaml:    SoftwareVersions: recommended
src/schema/rules/sidecars/nirs.yaml:    SoftwareVersions: recommended

❯ git grep '\<SoftwareVersion\>'
src/modality-agnostic-files/events.md:        "SoftwareVersion": "3.0.14",
src/schema/objects/metadata.yaml:SoftwareVersion:
src/schema/objects/metadata.yaml:  name: SoftwareVersion
src/schema/objects/metadata.yaml:    - SoftwareVersion
src/schema/objects/metadata.yaml:    SoftwareVersion:
src/schema/objects/metadata.yaml:      $ref: objects.metadata.SoftwareVersion

with master gaining 1 more hit

src/modality-specific-files/physiological-recordings.md:    "SoftwareVersion": "SREB1.10.1630 WIN32 LID:F2AE011 Mod:2017.04.21 15:19 CEST",

with plural form used more and singular, even as of current master (hence having bep020 merged) having singular form described as

SoftwareVersion:
  name: SoftwareVersion
  display_name: Software Version
  description: |
    Version of the software that was used to present the stimuli.
  type: string

thus pointing only to stimuli ...

There is also another singular

❯ git grep '[a-z]SoftwareVersions*\>'
src/schema/objects/metadata.yaml:HardcopyDeviceSoftwareVersion:
src/schema/objects/metadata.yaml:  name: HardcopyDeviceSoftwareVersion
src/schema/rules/sidecars/mri.yaml:    HardcopyDeviceSoftwareVersion: deprecated

which was deprecated.

So, overall, I think

• fix BEP020 fix: should be plural SoftwareVersions for _physio.md (eye tracking) #2328
• we should overall move to use plural form since already used in more places, and deprecate SoftwareVersion
• provide auto-migration support for deprecated fields (Provide "migrate" helper to adopt (new) standardized aspects in datasets #1984 )

[yarikoptic]

attn @bids-standard/bep044 btw -- since _events are dear to its heart, but also may be it could/would be interacting in the future with @bids-standard/bep028 since relates.