Set default settings on install/update

[Valkyr-JS]

Stash treats plugin settings as undefined until the user manually changes them, however their default appears as 0 numbers and false for booleans. This is problematic for users updating these values in the first instance, when a default should have a higher number or true as the default. For example, Most Appears With should show a default of 3, not 0.

This can potentially be set with a subscription to check when the plugin is installed or updated, and when triggered run a mutation on the plugin settings. This may not work, however.

[Valkyr-JS]

This seems possible on updating packages, but not on installing packages, which is the ideal time for it to run. The GQL seems to need to run within a PluginApi.patch.... So this can't run immediately on install.

Even if this was possible, it would be a pretty hacky way to do it. The ideal way would be to have a native defaultSettings property in the plugin yaml file, like defaultArgs for tasks. Will raise as a request and revisit this issue if/when that is implemented.

[Valkyr-JS]

stashapp/stash#4510 (comment)