Fracking: Save some processing, we don't need the initial draw anymore
Fracking: Better state management for wells

This will ensure that things always go in the order of drill, explode,
fill/frack, empty, collect.
Fracking: Fix NPE when adjusting viewport scroll location
Fracking: Don't allow drilling once a well has been filled
Fracking: Fix wells filling when they shouldn't
Fracking: Enable/disable control buttons based on model events
Fracking: Report harvested methane in step() rather than in a timer
Bump AgentScript version