[IMP] system framework, ORM updated.
[IMP] application startup, fragment manager, drawer listener updated
[IMP] note module udpated as per new framework
[IMP] sync data limit improved, seperate account sync updated
[IMP] message module update as per new framework
[IMP] mail group module update as per new framework
[IMP] meeting(event) module update as per new framework
[IMP] calendar code updated
[IMP] backstate issue updated
[MERGE] merging from main branch