CLI: clean up encoder preset/tune/profile/level option names

The new generic option names are:

--encoder-preset
--encoder-tune
--encoder-profile
--encoder-level

In addition, the supported values for these options can be listed via:

--encoder-preset-list  <encoder>
--encoder-tune-list    <encoder>
--encoder-profile-list <encoder>
--encoder-level-list   <encoder>

Existing encoder-specific option names are preserved so as not to break
existing scripts, but only the new generic names are documented and supported.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6135 b64f7644-9d1e-0410-96f1-a4d463321fa5