Add red text on an invalid command

What has been done in this MR?

• Red text now appears when an invalid command is used
• Yellow text now appears if the legacy command system is used
• While testing this setqueststage raised an exception with only one arg which was fixed.

What should testers check?

• All legacy commands result in a depreciated warning appearing
• All modern commands work
• Any invalid command prints in red text
• Set quest stage gives an error message if only 1 argument is supplied

If the depreciation warning isn't wanted I can roll back those changes.

• I have tested these changes thoroughly.

• I used the relevant Thanos/Zaros tool for any JSON edits where possible, and have attached screenshots of any changes.