This allows the languages resource to be read from file or from inline
data. Additionally it fixes a bug where the language combo box would
always be reset to en as the default regardless of what was currently
configured.
The GTK resource handling can now provide the path to resources rather
than having to compute them separately. This reduces run time
allocation and allows for the resources to be built in if required.
Additionally this tweaks the resource scheme handling to redirect
favicon.ico to resource:favicon.png instead of rewriting directly to
file scheme path allowing the favicon to be a compiled in resource.
GTK UI builder resources have till now been exclusively stored on disc
requiring netsurf to ship numerous additional resource files. This
requires going to disc every time a UI action is performed which can
become a lot of unwanted file handling.
GLib/GTK has moved towards GResource handling for such resources
instead. It now seems that migrating to this style of usage is
expected and indeed the only portable way to include pixbufs.
This introduces an API to hide the various implementation details of
how resources are handled from the rest of the codebase.
This changes the LOG macro to be varadic removing the need for all
callsites to have double bracketing and allows for future improvement
on how we use the logging macros.
The callsites were changed with coccinelle and the changes checked by
hand. Compile tested for several frontends but not all.
A formatting annotation has also been added which allows the compiler
to check the parameters and types passed to the logging.
