auto completion in buffers

[felixangell]

would be nice to have a little auto complete menu rendered with some keywords/words measured from the buffer? in addition to this it should be relatively flexible so that we can potentially add our own recommendations, perhaps per language or something?

[felixangell]

tracking:

• [ ] arrow up/down selects suggestions if they exist
• [ ] pressing enter completes the word from the suggestion box
• [ ] handle all little edge cases for the vocabulary stuff
• [ ] some kind of thread that will go over a document and load all of the words in the background?
• [ ] dont show more than X amount of suggestions/scrolling feature so its fixed in the box menu thing?
• [ ] add padding to the items
• [ ] set the width of the box accordingly
• [ ] add configuration option thingies for colours