Replaced one-purpose fetchers with a multi-purpose. Added a fetcher for fetching the student sheet.
Added a fetcher that returns a given range in a given tab, for a given student.
Removed an old file, no longer used.
Two minor fixes. One comment removed, one small statement updated to get rid of an annoying error message.
Options processor for studentActions now keep default options, if no new were set by the UI app.
StudentActions now can handle components that have options, but no option processor.
Added a plugin for updating colors in the student sheets.
Added a validator to the studentsheetupdate plugin.
Some improvements in the plugin for creating student sheets: a helper function, and some color settings.
Fixed some bugs that became evident when resetting all sheet properties.