Implement a -v|--version argument for avmctl and avm-motion-triggerd

Acceptance Criteria

• A call to avmctl or avm-motion-triggerd with the -v|--version argument should display the version

Tasks

• Add a VERSION definition while compiling
• Add the -v|--version argument to the list of known arguments
• Link the argument if detected to a function which prints out the details
• Document the new arguments on the man pages