Allow simple sms rate limiting
Add sms load balancing
Add form mixin for managing the load balancing phone numbers
Small fix
Add rate limiting for Mach backend
PR feedback
Rename file
Merge pull request #3479 from dimagi/sms-load-balance

SMS Rate Limiting and Load Balancing
add a local authority to media resources for offline install
Merge remote-tracking branch 'origin/multimedia-case-properties' into autostaging
Merge remote-tracking branch 'origin/sqlfct' into autostaging
Merge branch 'sqlformcompletiontime' into autostaging
Merge remote-tracking branch 'origin/cache-locations' into autostaging
Merge remote-tracking branch 'origin/hq-dropdown' into autostaging
Merge remote-tracking branch 'origin/dynamic-links' into autostaging
Merge branch 'offline-install-multimedia' into autostaging
update submodule refs