Add navigation for keyboard/pointer equipped devices

[Alan Pope 🍺🐧🐱 🦄]

When running osmtouch on my laptop (with keyboard/mouse, without touchscreen) I am unable to easily navigate the application. I'd propose.

In map view:-
Mouse scroll up/down & Keyboard + / - (or = for those where shift is required for -): Zoom map in/out
Arrows: Pan map

In search view
Escape: Close search sheet
Arrows + Enter: Navigate search results

[ybon (yohanboniface)]

Added basic support for wheel zoom/unzoom + double-click to zoom.

[ybon (yohanboniface)]

Ah, oops, this breaks pitch zoom :s

[ybon (yohanboniface)]

So, as just discussed now in IRC, as for my understanding of the situation, we need QT5.2 to be able to mix gestures and mouse events on a map the simple way.
As I'm far from mastering Qt (I'm just one week with an Ubuntu Phone, and never looked at Qt before...), Qt is huge, and I don't find any detailled changelog, I may we missing something, so I keep eyes open.

For the record, this seems the way to go: https://qt.gitorious.org/qt/qtlocation/source/0bf5ada5bbf9d01b1850befc7f1bf6863770ea5b:examples/declarative/mapviewer/content/map/MapComponent.qml#L484-485

But it seems we need this commit in QtLocation before: https://qt.gitorious.org/qt/qtlocation/commit/29af7e577e34089f781322351043de39c025e01e