Added support for inject args to actions in OpenSfM Flow
Added support for inject args to actions in OpenSfM Flow

Summary:
- Added optional config file to inject arguments to the actions.
- Update opensfm_flow to parse command_args.
- rigs.py Fixed bug to not use float as indexes, (/ -> //)

Reviewed By: mlopezantequera

Differential Revision: D27592473

fbshipit-source-id: f18bc265f0cd4593fe227e8b2cab3e34b401b77a

mapillary/OpenSfM,mapillary/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,mapillary/OpenSfM,oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM