Introduce new CheckCommandEvent. This will allow addons to react when a
player does /ar check. This might come in handy if an addon wants to
show different info than Autorank's 'vanilla' system does.

Signed-off-by: Staartvin <mijnleraar@msn.com>
Clarification.

Signed-off-by: Staartvin <mijnleraar@msn.com>
Let's try this.

Signed-off-by: Staartvin <mijnleraar@msn.com>