Address a few hyperlink related issues

In edit mode:
* Pressing Ctrl+Click or Command+Click open a hyperlink on Mac. Change it so only Command+Click open a hyperlink. This matches the behaviour of LibreOffice.
* Ctrl/cmd + click opens up two new tabs in FireFox. 
* Cursor stays as hand on hyperlink after ctrl key is released.

In read only mode:
* Pressing Ctrl turn the cursor to caret on hyperlinks.