Multiple mixins are allowed of course. Allowing multiple implementations lead to too many problems due to plugin names for referring to the APIs of SimpleApiPlugins or the assets of AssetPlugins.
Hence __plugin_implementations__ has been deprecated in favor of __plugin_implementation__. The plugin subsystem will automatically copy the first implementation from __plugin_implementations__ to __plugin_implementation__ and log a deprecation warning.
Adjusted documentation accordingly. Also added docs for helpers.
Preprocessing for better performancy, unit tests for preprocessing, controls don't need a type anymore (makes things way less complicated and repetitive)
Refactored some things in octoprint.util.comm and octoprint.settings, added migration function to get users of the devel version up to date with their gcode scripts. Migration function will be removed again one week from now.
- renamed methods from camelCase to snake_case
- renamed callback mathods from comm module from camelCase to snake_case
- extracted and documented public interface to be used by plugins
- extracted callback interface to be implemented by subscribed callbacks to printer
- moved standard implementation to custom package
- moved time estimation classes to custom package
