Move event filter value from structural subscriptions to subscription filter objects

database/sampledata/current-dev.sql (+4/-4)
database/sampledata/current.sql (+4/-4)
database/schema/comments.sql (+1/-1)
database/schema/patch-2208-37-0.sql (+12/-0)
lib/canonical/launchpad/mail/helpers.py (+1/-5)
lib/lp/bugs/browser/bugsubscriptionfilter.py (+45/-1)
lib/lp/bugs/browser/structuralsubscription.py (+4/-35)
lib/lp/bugs/browser/tests/test_bugsubscriptionfilter.py (+85/-0)
lib/lp/bugs/browser/tests/test_structuralsubscription.py (+0/-133)
lib/lp/bugs/doc/bug-change.txt (+7/-2)
lib/lp/bugs/doc/bugnotification-sending.txt (+133/-10)
lib/lp/bugs/doc/bugsubscription.txt (+15/-8)
lib/lp/bugs/doc/structural-subscriptions.txt (+0/-2)
lib/lp/bugs/interfaces/bugsubscriptionfilter.py (+8/-0)
lib/lp/bugs/interfaces/structuralsubscription.py (+6/-26)
lib/lp/bugs/model/bugsubscriptionfilter.py (+6/-0)
lib/lp/bugs/model/structuralsubscription.py (+16/-35)
lib/lp/bugs/model/tests/test_bugsubscriptionfilter.py (+9/-0)
lib/lp/bugs/model/tests/test_bugtask.py (+3/-2)
lib/lp/bugs/tests/structural-subscription-target.txt (+10/-19)
lib/lp/bugs/tests/test_bugchanges.py (+4/-1)
lib/lp/bugs/tests/test_structuralsubscriptiontarget.py (+3/-6)
lib/lp/registry/doc/private-team-roles.txt (+0/-4)