Restrict CSS resize to vertical on <textarea> (#2778)
Restrict CSS resize to vertical on <textarea> (#2778)

Enabled by default in nearly all browsers, `<textarea>` form fields can be resized.  This rule restricts that resize ability to `vertical`, to help this browser feature play nice with Symphony's column layout.  [CSS resize support](https://caniuse.com/#feat=css-resize) is good, except for IE, naturally!

Picked from 0fe36e3
michael-e/symphony-2,symphonycms/symphony-2,bauhouse/sym-todo-list,symphonycms/symphony-2,bauhouse/sym-todo-list,michael-e/symphony-2