Clean up some Code.
Remove erroneous RequiredInventorySpace Package
Only Generate Example Package if no other exist.

Now the plugin will only generate the example package if no other
packages exist, meaning this package may now be removed.
Add Config Value to specify points string.

This is used if AutoFillSigns is true, this changes the value for
"Points"
Rework Expiration Checker

ExpireTime value is now in minutes instead of days, allows for more
precision.
Periodically Check for Expired Packages

Configurable, by default runs every 5 minutes.
No Longer Check onPlayerLogin

Due to the new check method for ExpiredPackages, it is no longer
necessary to check every time a player logs in.
v1.10.0