Move tilecreator to tools. Place generated srtm tiles in data.

Also removes the TILES_AT_COMPILETIME cmake option.
Previously tilecreator was compiled by cmake and then executed
to generate tiles from srtm.jpg. The size difference between both
is not large (3.1 MB vs 3.8 MB) so the additional complexity is
avoided now and the generated tiles are placed in data/ directly.

This does not affect the installation result in any way. Just the
source repository grows slightly.

tilecreator is now available from tools/tilecreator/ and can be
compiled using cmake.
We're also using dbus.
runtime trace: better labels
SVN_SILENT made messages (.desktop file)
Adds a TileID::toLatLonBox() function returning a tileId's corresponding bounding box (REVIEW: 111839)
Adds overlay rendering support
Make use of TileId::toLatLonBox in GroundOverlay rendering
rename private slot for more clarity
SVN_SILENT made messages (.desktop file)
remove unused variable
fix sky rotation

The plugin would only rotate the sky after the map had covered the whole screen.
remove unused class WikipediaService
Remove include of private header
Remove include of private header
create dedicated widgets for configuration pages
[API change] remove getters for unused+unimplemented settings
fix wrong menu string copy+paste error
remove shortcut
Adds tutorial for rendering ground overlays
facelift for cache settings widget

* use suffix rather than additional QLabel for spin boxes
* use group box for housing username and password inputs