Really Simple Tanks

* Added more tooltips, including:
 * * tooltip to the inventory to show contents and mode
 * * mode in TOP
 * * tooltips in the GUI for new features.
* Cleanup OnBlockActivated code.
* Prevent tank stacking (even if NBTTags match).
* Manual "Dump Tank" button below the Fluid Gauge in the GUI. CTRL+LEFT-CLICK will void/empty the tank.
* Tank Mode button to cycle the modes
 * * NORMAL - no special handling (works as before)
 * * EXCESS - voids fluids inserted in excess of tank capacity after the tank is full.
 * * PUMP - Not yet implemented.
* Upgrade Slots for items required for Tank Modes to function.
 * *Excess Upgrade Item added.
* Various restructuring to make the package layout make more sense, and to allow updating the dev instance in via build.gradle and build.properties easier.
* Fixed dupe bug. /s