- The scattering of DLL export macro's is kind of useless;
there are several headers, and then the export macro isn't
even applied consistently. Just drop the one for UI exports,
which was only used in libcalamaresui.
- do static initialization more carefully
- float -> qreal (double) because that's what the Qt API expects,
to reduce type-conversion warnings
- apply current coding style
This also adds ImageRegistry, a SVG cache, a bunch of utility functions
for shared pixmaps in CalamaresUtilsGui and renames several qrc files
in viewmodules.
