AQuickSettingsTile: added onTilePostCreate method
Implement intent service and result receiver
- enables communication channel between GravityBox code
hosted in remote process and GravityBox app itself
- enables to execute tasks which remote process has no permissions for
- implemented action to read and set status of master SYNC - this cannot
be done directly in systemui process since it doesn't have required
permissions to read/write
SYNC state.