Added ITankContainerBucketable

Interface that says whether buckets should be able to fill and drain an
ITankContainer
TEFactoryInventory not bucketable

(By default. The children of this that actually implement
ITankContainerBucketable will need to override.)
Giving iTCB to the liquid fabs

for testing
iTCB on liquid fabs/gens

for testing
iTCB handling in BFM

now I just need to replace the contents of those utils with something
other than "return false;"
manual tank filling implemented
manual draining of tanks
everything else fillable/drainable
right, weather machine exists
fixed
creative mode for bucketfills

also minor formatting changes
Buckets with LC = silly
MultiPlanter returns.
moved iTCB to core
derp, package marker
okay, for real this time
AutoSpawner serializes spawn exact mode correctly
Non-milk buckets can place liquids
More bad effects for sewage/sludge swimming
Enabled witherskull drops for the grinder