Replace get_identifier/get_description functions with strings.

This is the start of a new experimental branch, with the first objective being
the replacement of the get_description and get_identifier functions with
direct-access strings.

The reason for this change is to reduce code size and time of execution.
By replacing the functions with direct-access strings there is one less call
to be done in those cases where the description has to be fetched.

The solution is not yet definitive though, there are a couple of problems to
take care of:

 - the use of N_() still makes it easy to internationalise the strings, but it
   requires for the string to be found on libxine2 catalog, which is not
   exactly a nice solution for external plugins;
 - it would be simpler to re-use the id field in plugin_info_t, and then move
   description there; it should reduce memory usage for the class structures;
 - I'm not really aware of any reason why get_description and get_identifier
   were used beside the idea of making i18n simpler.

This probably would break a couple of frontends, especially if they have some
internal plugins (like post-plugins), so it needs to be reviewed carefully
before merging in 1.2 branch. My current goal is to get this in before 1.2
though, rather than waiting for 1.3.

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