Opt out command signing

[Madpeterz]

Currently all commands from scripts must have a vaild command signing hash

this feature will add a new config value

security_master_owner_optout :  false

when true commands from scripts are allowed to drop the command signing requirement and it will be treated as if the command was a IM directly from the master.

notes: if you res unknown scripts with this set to true the scripts could issue commands to the bot so this is a small security risk and should not be enabled for bots that have funds enabled.