Fixes get and set armour
Update FallingBlock to new Anvil formats, possible fix for #2189

I don't have time to test yet, so I am not sure if it does fix it.
Merge pull request #2223 from Falkirks/set-armour-fix

Fix various get and set armour in PlayerInventory
Fix FallingBlock.php
Merge pull request #2225 from PEMapModder/falling-sand

Update FallingBlock to new Anvil formats, possible fix for #2189
Update BaseInventory.php
Merge pull request #2235 from nno88551/patch-2

Update BaseInventory.php
Implemented Vector3 List and AxisAlignedBB Pool to decrease object allocation
Drop invalid entities / tile entities on chunk loading
Merge branch 'master' of github.com:PocketMine/PocketMine-MP
Fixed entities not getting ticks on movement
Fixed /setworldspawn changing sender data
Bump API version to  1.6.1
Mark chunk to be saved when removing invalid entities/tiles
Updated RakLib
Improved network packets allocation
Bumped API version to 1.7.0
RakLib update
RakLib update
Bump API version to  1.6.1