No Newlines CodeMirror addon
Add a configuration option to CodeMirror called "noNewlines" that when set as true
will prevent any newline characters from being typed into the CodeMirror editor and any newline character pasted into the editor will be replaced by a single space.
Usage
var myCodeMirror = ;
Attribution
Significant inspiration from https://discuss.codemirror.net/t/single-line-codemirror/195/4