runeffect command should support specifying the effect class

[einarf]

Right now runeffect simply picks the first runnable effect. This is a side effect of effect packages only supporting a single effect in the past.

Now that multiple effects can be created in an effect package, the following sounds reasonable:

• If an effect module path is passed to runeffect we grab the first runnable effect as before. Example: runeffect examples.warpspeed
• If the python path ends with an effect class, we run that specific effect. A runnable=True check should at least be performed. Example: runeffect examples.minecraft.MinecraftEffect

[einarf]

Fixed