Add focus-mode which displays the currently typed word in fixed overlay #83
Description
Origin
https://github.com/kensanata/typing/issues/1
Description
new custom variable speed-type-focus-mode which is nil or non-nil.
Add a feature where the user only sees one word at a time.
This should be done with some sort of overlay which is fixed. The cursor in the speed-type-buffer still moves but the text and the cursor is made invisible. There should only be the coloring of the current typed word in the overlay. If the word is finished writing the overlay is flushed and supplied with the next word.
If the user moves the cursor the word should switch to what ever word the user switched to.
This way the user can concentrate his eyes on one fixed position. They don't have to follow the cursor.
If I toggle the focus-mode the speed-type-buffer should change it's behavior without having to reset or restart the typing session.