[New Command] Custom commands

[noobidev]

Describe your Idea
Create custom guild specific commands

command steps
Steps as the command can be used.

1. 'customcommand create hello Hello {user.mention}' - create a command named hello

Expected behavior

1. Create a guild specific custom command called hello which sends Hello <user mention> only for the specific guild

Additional information
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Webinterface Feature
Manage custom commands in PWI