Assimilate 8 drones

Assimilate boxquote           v2.1-1-g7e47e0e
Assimilate expand-region       0.11.0-36-gea6b4cb
Assimilate hl-todo            v3.1.1-2-g3bba459
Assimilate orgalist            b436971
Assimilate page-break-lines    0.11-29-g314b397
Assimilate unkillable-scratch  1.0.0-5-gb24c2a7
Assimilate which-key          v3.4.0-24-g8b49ae9
Assimilate yasnippet           0.14.0-6-g5b1217a

Also, remove some unused (use-package ...) forms.