Document completion shortcuts

- Dot-completion templates that have snippets that can be inserted now tell you (took me quite a while to figure this one out, don't think many ppl know about it):

![](http://i.imgur.com/KTyFnA1.png)

- Changed the "Help" shortuct from `F1` to `Ctrl+F1` to fix the conflict with "show calltip details".
- Shortened calltips now mention the `F1` shortcut (another little-known shortcut):

![](http://i.imgur.com/AjA6ALY.png)

We don't want to peek at the filesystem for each keyword to look for a snippet.

That makes sense to verify that there is a snippet but that should be delayed to when the tooltip is displayed. The logic could be moved in the MemberItem class which provides the hint text when the list item is focused. That's also at this moment that the doc is parsed and formatted.