This patch adds an icon displayed above the cursor inside a template. By clicking it, the template parameters become hidden and replaced by three dots, while the template name remains visible. Clicking the dots will unfold the template. New key bindings include fold (Ctrl-Shift-[/Cmd-Alt-[), unfold (Ctrl-Shift-]/Cmd-Alt-]) and unfoldAll (Ctrl-Alt-]).
Bug: T30684
Change-Id: I631fe0ecf21d0a80306bd40d66d22478a1aefe58
