encoder: Update app usage, name, and version.

- v2.0.0.0.
- Remove target URL requirement.
- Note in the usage that uploading is disabled, and where
  output files will be written.
- Rename app name/version variable (s/Client//).

Change-Id: I5db6514818cf4b45a6f9f9e084dca3018d306e57
4 files changed