Add ability to un-/re/load plugins by command

[hashworks]

This way you could temporarily disable plugins without the need of altering the config file. Also this helps to develope plugins.

PS: I'll post stuff I'll work on over the next days. Feel free to implement them if you find time.

[hashworks]

Sadly it isn't possible in PHP to redefine a class (reload) without restarting the script. It's possible with runkit, but it's too experimental.