Electronics booking

This wraps up most all the electronic gear.  I'll be cross-referencing
(2 sources per recipe seems a good minimum) but most of it's locked
down.
Archery booking

Added two more recipe books and distributed the recipes to them & some
of the archery/survival ones.  Left the selfbow and field-point arrows
autolearned so folks aren't left completely unarmed in a no-city game.
Added a rechargeable battery pack mod for tools, rechargeing station for vehicles, added 'INTERNAL' vpart flag which requires the part to be installed on a tile with a 'CARGO' vpart and 'RECHARGE' which has a twin item flag, which allows the rechargeing vpart to charge a tool with the same flag..
Forgot item_groups.json
Remove commented code
Fixed gramar error.
Added DOUBLE_AMMO and RECHARGE charge display.
Fixed another grammar error.
Added flag info to JSON_FLAGS.md and fixed a few typos.
Fixed unloading issue. Also added non-unloadable notice as per KA101's suggestion.
Added another message about item not being unloadable.
Swaps a capital for a lowercase in armor.json.
Eases up on arrow and bow autolearns

Chiefly because selfbow & field-point ONLY might be a bit much for
no-city players.
Because of derp.
Added recipes.
Changed item descriptions as per NaturesWitness's suggestions.
Set a recharge rate of 100 charges/hr.
More suggestions by NaturesWitness.
Fogot a line.
Added ability to define a skill requirement for construction.