aquarium: Replace Bob completely (😥)

[obiwac]

Bob is becoming increasingly redundant, but for it to be completely replaced, the following tasks must first be completed:

• [x] A way to create template files from pre-existing aquariums (-o flag?).
• [x] Kernel templates alongside regular templates when creating aquariums #11.
• [x] A way to create bootable images from pre-existing aquriums (which also have a kernel template) (-i flag?).
• [x] A way to copy files inside of aquariums #16 .
• [x] #17

Once all this is done, the method for creating templates should look a little something like this:

aquarium -c my-template -t amd64.aquabsd.0422a
aquarium -e my-template < custom.sh
aquarium -T my-template -o my-template.txz # create 'my-template.txz' template file

And for creating bootable images:

aquarium -c my-image -t amd64.aquabsd.0422a -k amd64.aquabsd.0422a
aquarium -e my-image < custom.sh
aquarium -i my-image -o my-image.img # create 'my-image.img' bootable image file

(More details can be found in ananas/aquariums/README.md.)