Revert "remove sensor and prevent player from jumping in some case"

This reverts commit 8bc1da94bdd73ce08efe30cf96226420fe649990.
Revert "Revert "remove sensor and prevent player from jumping in some case""

This reverts commit 080a5c4de7d308485930b41eeba74490b6d9bef2.
Merge remote-tracking branch 'origin/master'