Adapt to WoltLab/WCF@8ce85e3a0
Add license to package.xml
Open copyright links in a new tab
Use formal German
Implement command aliases

Closes #35
Make commands more flexible

Now aliases like “toRoot:whisper root,” are possible.
Fix aliasing
Throw InvalidArgumentException instead of NotFoundException

It provides better error messages for the user
Don't delete expired suspensions
Merge branch 'master' into suspensionList

Conflicts:
	package.xml