LiveRecorder to log its version when starting recording

It could be useful to be able to identify the LiveRecorder version by its log file.

When our customers integrate LR in their product there might be times when we work with them to verify a bug has been fixed. In those times it would be useful to have a visual confirmation at the beginning of the test about what version of LR the process is using.

If the first line of the log produced by LR contains the version information, that would be enough to make sure the right version is running.

Currently the only way to extract the LiveRecorder version information are as follows:

- The log file contains the version if the run has ended with a crash.

- The binaries and live-record_x64 can be searched for the embedded version string with a command like string | grep undo-.

Agreed, this would be very helpful for pretty much everyone involved.