BUG: Commands/Alias with another slash on the front

[TheMeinerLP]

Use case: If you will create like worldedit commands //schematic like you need currently to create X methods for each alias. Cloud can't current support this on a command method annotation:

@CommandMethod("/schematic|/schem save <filename> [format]")
@CommandPermission("worldedit.schematic.save")
fun saveSchematic(..)