Slash bit flags options

Allow adding bitwise flags as a command option type, obviously we don't expect the user to know how bits work and will not ask for the raw integer, but would rather be a hybrid of the integer/boolean choices. This would allow a new multi-checkbox functionality that would normally clutter commands with a bunch of boolean options.

You can turn commands such as
/command boolean1:True boolean2:False boolean3:True
into
/command booleans:5