This PR added default top-level configuration values, so a configuration
file is no longer strictly required except to override defaults. Adjust
the wording of the relevant README sections to reflect this.
This commit represents a complete refactoring of rffmpeg while
preserving all existing functionality.
Several key changes are:
1. A cleaner function tree throughout the code, hopefully making things
easier to understand.
2. The use of "-t -t" to the "ssh" command to optimize behaviour when
Ctrl+C is used to terminate a test process.
3. The removal of the old PID-based "state" system in favour of a
ground-up SQLite-based system which can better track the current status.
4. The renaming of the binary from "rffmpeg.py" to "rffmpeg".
5. The addition of an alternate invocation and corresponding Click-based
CLI interface to manage the database, accessible by calling the
"rffmpeg" binary name directly instead of an "ffmpeg"/"ffprobe" alias.
6. The moving of host management out of the config file and into the
database/Click CLI interface for better management capabilities.
7. The proper defaulting of the configuration; an entirely empty
configuration can be specified if desired, using only default options.
This new version should be functionally identical to the old version in
all cases while providing the above changes.
This commit also adjust the documentation to reflect the updated setup
and options.
