Faster Elftown

There has lately been an issue with that Elftown hangs for a long time pretty often.

It had to do with the diff that you can see on wiki-pages. If the wiki-page is huge, that function can take a minute.

It should be considerably faster now. But I still strongly recommend that you keep the wiki-page size down and make more pages instead. It's generally easier for both you, others and Elftown. There will be no hard limit at the moment though.

(The pages that caused problems were 70 pages of texts, which is quite a novel.)

You might also notice that the output from the diff-button will look a little different. It will now (mostly) look for different words, instead of different characters.