Style nits to core_info. Compile it in.
Use consistent namespace for core_list.
Begin implementing core autoselect.
Some display tweaks.
Start refactoring file_extract.

Add support for low-level parsing of zip contents.
Poke into zip files as well to find matches.
Only create autodetect if we have info files.
Rework extension files to only consider basename.

Only consider last '.' in the basename of a file.
Add core_info_list_get_display_name.

Avoids duped code in RGUI.
Move core_info stuff to menu_common.
Merge pull request #326 from libretro/coreinfo

Integration of core info files in RGUI.