Add support for names in MobKill objective

Command event now accepts multiple commands separated by |
Add aliases to commands
Replace betonquest.createnpc permission with betonquest.admin
Command description now uses alias instead of hardcoded "q"

Signed-off-by: Co0sh <coosheck@gmail.com>
Objectives are now directly defined in events, not in objectives.yml

Add converter for objectives
Change version to 1.5

Signed-off-by: Co0sh <coosheck@gmail.com>