CmdLineParser: deprecated --template <template> and --template-location <template> (#5331)

Both are bugprone since they just take the next parameter which doesn't
start with `-`.

Also `--template` has not been documented since
1784239 back in 2011(!). And
`--template-location` has never been documented since its induction in
f058d9a. That's also why we can have a
short deprecation period.

Author: firewave