Add support for passing configuration arguments via command line

[richbl]

DOES:

Currently BSC is only configured via a TOML file

SHOULD:

For some use cases, it may be useful to pass configuration options via command line. For example, use a command line switch to override the video file to be played. Or use the cli to override any number of TOML settings

[richbl]

The current implementation that addresses this item request allows for the command-line override of the TOML configuration file via the --config or -c flag (e.g., ble-sync-cycle -c home/user/.config/BSC/config.toml)

Other flags may get implemented in the future, but should be driven by request tickets that expressly identify specific needs/use cases.