Some Calamares source files incorporate material from
3rd parties (unlike the 3rdparty/ dir, which is basically-
unchanged 3rd party source). Tidy up the FileCopyrightText
lines for those sources.
This is not an exhaustive effort.
- 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
- In debug mode, hitting assert(false) is meaningless,
- In release mode, the assert is optimized out.
- So assert the condition we're actually testing, for better messages.
This also adds ImageRegistry, a SVG cache, a bunch of utility functions
for shared pixmaps in CalamaresUtilsGui and renames several qrc files
in viewmodules.
