Improve JsonRPC plugin settings

[Garulf]

Problem

• JsonRPC plugins are unable to make settings changes unless they have a SettingsTemplate.yaml file.
• Plugin's are unable to initiate new setting keys
• Plugin settings are only saved to disk upon exit

Solution

• Allow plugins without SettingsTemplate.yaml to change their settings
• Remove logic restricting settings key creation
• Save plugin settings to file when updated

[github-actions]

@check-spelling-bot Report

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Unrecognized words (4)

hyperlink
linkbtn
Linq
SYSLIB

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... in a clone of the [email protected]:Flow-Launcher/Flow.Launcher.git repository
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perl - 'https://github.com/Flow-Launcher/Flow.Launcher/actions/runs/6919276522/attempts/1'

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Errors (3)

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❌ Errors	Count
❌ ignored-expect-variant	6
ℹ️ no-newline-at-eof	1
ℹ️ non-alpha-in-dictionary	9

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[taooceros]

sorry another thoughts that why didn't we keep this consistent with other plugins. Save only be called when manually triggered or flow being closed?

[Garulf]

I guess just personal preference. It feels off to not save to file on change.

[taooceros]

yeah ok