Electronic cigarettes.
Removed unused code.
Specify that some e-cigs are disposable.
Add e-cigs to item groups.
Set turns_per_charge to 1 instead of 20, just in case - not sure if it's necessary.
Better description of advanced e-cigs.
Merge remote-tracking branch 'dda/pr/6532' into dda-master

* dda/pr/6532:
  Better description of advanced e-cigs.
  Set turns_per_charge to 1 instead of 20, just in case - not sure if it's necessary.
  Add e-cigs to item groups.
  Specify that some e-cigs are disposable.
  Removed unused code.
  Electronic cigarettes.

Conflicts:
	data/json/item_groups.json
	data/json/items/tools.json