Implement camel casel based word navigation

[kkoreilly]

This is possible in VSCode and is very important when writing Go code.

[kkoreilly]

#666 is somewhat related.

[kkoreilly]

We also need to determine how punctuation should be handled during word navigation.

[kkoreilly]

Also, we need to resolve our line based navigation and deletion structure.

[kkoreilly]

There are also some problems with word based navigation not working at all and triggering nil key funs.