Add a setting to limit sentences to only single words

[byronwall]

Or total character count?

[byronwall]

Appears to need a raw query? Was able to work around using the focus system

[byronwall]

Plan:

• [x] Add a word count column to the sentences table
• [x] Migrate data to update the word count
• [x] Add correct word count during sentence creation
• [x] Allow the profile to set a minimum number of words to include

Future plans could include reading level or more complicated checks