Custom Event Registration + Settings bugfix

This release implements custom event registration as requested in #1. This makes any Custom Gcode Event also show up in e.g. the EventManager.

It also fixes the bug in #3 such that adding new rows to the received hook are once again possible.

Custom Event Registration

This is a pre-release for adding registration of custom gcode events to the Event Manager.

RC for issue #1.

Added configurable re-fire threshold for received gcode hooks.

Users are now able to define a default re-fire threshold which blocks the re-firing of events if a gcode match is received again within the threshold range.

It is also possible to configure individual gcode hooks with different re-fire thresholds.

Enable/disable GCode Hook added

A minor improvement that allows users to enable / disable GCode hooks without deleting them.

Initial release

Filled in description + email fields in setup.py


Minor logging cleanup.