Remove pointless autoload files & optimise startup times

Over time ALE builds up a lot of autoload files in the project that add to the runtime cost of running ALE, and often these files contain only 1 or 2 functions in them at a time. Over time, people learn bad habits by reading the code of adding in new autoload files, which make the runtime cost worse.

It's time we had another pass over the codebase and eliminated more pointless uses of autoload files, even if we have some light code duplication, as that will make ALE a little bit faster and the code easier to read.