Fix unneeded rewriting of settings.json #3009
Merged
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It doesn't seem necessary to write settings to settings.json when registering a new option. The option is set to its default value, which means that it will not be written to settings.json (precisely because it's the default value), so the contents of settings.json don't change and thus don't need to be written again.
This unneeded writing, in particular, causes unexpected "The file on disk has changed. Reload file? (y,n,esc)" each time when we open settings.json via micro.
Fixes #2647
As a bonus, a few other small fixes and code improvements.