Legacy behaviour is mostly retained. The most notable change in behaviour is that invoking `resin deploy` without options is now allowed (see help string how it behaves).
In this commit there are also the following notable changes:
- Deploy/Build are promoted to primary commands
- Extracts QEMU-related code to a new file
- Adds a utility file to retrieve the CLI version and its parts
- Adds a helper that can be used to manipulate display on capable clients
- Declares several new dependencies. Most are already indirectly installed via some dependency
Change-Type: minor
