This reverts commit 37972939665e6e0d5e6fa8bef4ef6112db96b928, and partially 2c01b8d94a6c2ac5eb3a00003a78af2eb1bd0a6b. `2c01b8d9` accidentally reintroduced back the code reverted from `c6b02293e2c1357545fe9e8f9d473c0c18c1c758`. `collections` is not enough, say you want to subscribe to state change of specific ticket. State is not standalone record anymore. List of `org.tangled.event.*` NSIDs can solve this by defininig richer event definitions. Signed-off-by: Seongmin Lee <git@boltless.me>