ACCServerManager 0.3.0

### Notable changes
* added tracks of ACC 1.0
* cfg edit: eliminated save button, changes are applied on-the-fly
* cfg select: implemented renaming and cloning

### Notable changes
* user settings are now located in accservermanager/local_settings.py
* introduced DATA_DIR which holds the directory for configs/instances as well as the sqlite database
* allow to restart stopped instances
* only copy relevant files to the instance folder
* multiple changes related to docker, ie configuration via env vars