removed unused field
Support for IO modes in MjAPI
Merge pull request #1781 from Prototik/mjapi-iomode

Support for IO modes in MjAPI
Last changes to the Builder API, renaming to enfore consistency and
improve maintainability.

Close #1785
prepare 6.0.12 release
fixed spelling mistake
Remove unnecessary extends for ISidedBatteryProvider interface
Merge pull request #1792 from Prototik/mjapi

Remove unnecessary extends for ISidedBatteryProvider interface
Fix drain method causing dupe glitches...

...if using them mixed

Before the one accepting a FluidStack always returned null if the targeted tank was empty, but the one under it wasnt, the one w/ int doesnt have the problem.
Merge branch 'M3gaFr3ak-patch-1' into 6.0.x
fixed handling of unbreakable blocks, #1789
Merge remote-tracking branch 'origin/6.1.x' into 6.1.x