Undo/Redo should move the caret to the area of text being modified

[MartyMacGyver]

[This issue is observed both 1.0 and 1.5 Arduino editors in Windows.]

Unlike most GUI-based editors, when you undo or redo a change the editor makes no attempt to move the view to that line or area of the file.

• Open a long file that's longer than what'll fit in the visible editor area.
• Make a change and move the caret to somewhere else in the file so that the modification is now out of view
• "Undo" the change via the keyboard or menu
• Watch and wonder what happened because the undo occurred outside of the visible area of the editor
• Using "Redo" has the same (lack of visible) effect if the affected area is off-screen

It may sound trivial but as this is the first editor I've ever used that doesn't do this it detracts significantly from its usability. Given that other operations have no problem moving the caret in response to an error or other command, this should be a very simple improvement to implement.

[cmaglie]

Fixed, will be available in 1.5.2.
Duplicate of #278