cherry-pick from github.com/minetest/minetest_game> Vessels: Smaller/improved...

cherry-pick from github.com/minetest/minetest_game> Vessels: Smaller/improved textures, remove duplicated 'inv' textures

Removed unnecessary inventory textures
The drinking glass inventory texture now differs from
the node texture to be more clearly a drinking glass
Smaller textures to reduce size as nodes