* [Core] Settings improvements: Grouping w/labels, support for doubles
Layout improvements:
* Plugins can set `[SettingSuggestedColumnWidth(123)]` on a settings class to adjust the settings view column width to make it wider or narrower to fit things nicely.
* Plugins can set `[SettingNewGroup("label")]` on any setting property to force a "new paragraph", or group, of settings. If "label" is also provided, a grouping header with that text will also be created.
* A double precision up/down numeric control has been added. In support of this, there is now a precision value on the existing `[SettingNumericBounds]` attribute to specify the number of digits of precision the control displays/allows.
Plugins:
* The above have been applied/demonstrated on the Botanist and Explorer plugin settings.
* WIP: initial commit for observatory herald
* Plugin error handling refactor
* make error window non-modal
* tidy up plugin error handling
* first pass for basic herald functionality
* corrections for linux env
* Use FNV hash directly instead of managing through dictionary/index file
* resolve audio queuing issue, switch to personal NetCoreAudio fork
* merge cleanup
* add enable setting, populate defaults
* framework xml doc update
* Adjust settings, add style selection, replace locale with demonym in dropdown list.
* Test is position is on screen before saving/loading.
* use a default that's actually in the list
* chore: move all observatory repos to core
* only save journal folder on change, don't constantly re-check during monitoring
* chore: monorepo project changes
* chore: monorepo migration
