This makes the following error message less likely to be printed
when performing many concurrent HTTP requests:
Condition ' resolving == IP::RESOLVER_INVALID_ID ' is true. returned: ERR_BUG
This is already done in `Node.add_child()` documentation, but
this copies the note in `Node.owner` for good measure.
(cherry picked from commit be1acf3b92b8b7104fe4d1fab9fbd2a28400ff95)
For this reason, this PR binds the mesh merging functionality.
It also slightly modifies the calling from RoomManager to use a Vector of Node *, in order to allow binding of the function. - lawnjelly - cf1b3fdd55
