Move Space Caded Parentheses to own layer (#1452)

Move Space Caded Parentheses to own layer (#1452)

* Move Space Caded Parentheses to own layer

The space cadet parentheses where too much distracting. Therefore they are now on the function layer. I also added two more layers for also having angle brackets and curly braces on the shift keys forr better access.

Also updated the README

* Fixed SHIFT+Function key conflict

* Removed Angle Bracket and Curly Bracket layers, as they don't work corrrectly