Doing some long-needed maintenance on the MAL plugin

It seems like not too long ago mal-api.com died for good, causing some problems with our plugin. The `mal` command was failing silently due to mal-api.com requests timeouting, and the `mal3` command caused a delayed crash.

The changes made remove the requests to mal-api.com and the `mal3` command because maintaining its clunky code isn't worth the time considering how rarely it's used. Furthermore, some better error handling has been added to the `searchAnime` function.