- Added support for toggling aquifers
- Refactoring: Reloading and resaving of config files is now triggered
by signals from a newly introduced event bus. This eliminates the
dependencies between Property (and it's subclasses), Properties and
GameConfigFile.
- Refactoring: Property classes now listen for the
EVENT_BUS.config_reloaded signal. When that signal is emitted, they
reread their value and pass it to their clients via their value_changed
signal.