Fixes#4807.
We want to differentiate between a short copyright message and a
longer one that also contains a date. The long one is only needed in
one place in a typical keyboard project. This reduces maintenance when
making keyboard updates.
A few fixes and improvements:
* kmconvert was missing a command line parameter for `-target` to
specify the platform targets for a project
* kmconvert should avoid throwing unhandled exceptions, rather if
sentry is not present then just write to console.
* Include kmconvert and its data files in the deployment of kmcomp.zip,
which is done on the build agent (just need to make sure files are
in the right place here.)
* Side fix: also made sure kmcomp would emit the exception message to
console if sentry is not present.
