Enhance plugin create task

[sebinside]

The plugin creation sbt task (sbt create) should also generate the future metadata file and the class file. This should be implemented after the plugin structure rework.

See:

chatoverflow/project/BuildUtility.scala

Line 150 in 2cde2f9

def createPluginTask(pluginFolderNames: List[String]): Unit = {

This should be solved before: #41

[sebinside]

Note: Disable hyphens in plugin names