Zip IO plugin rewrite to properly support Zip compressed files (uses libzip compiled as libr_zip) 

-- Added the necessary libzip and libz files for opening zip files
   and reading and writing to them from memory via uri
-- Added support of jar:// zip:// and apk:// uris
-- Added the necessary build files to make building possible
-- Rewrote io_zip plugin to use the libzip (compiled as libr_zip)
   library