uncrustify: adapt config to the GtkSourceView coding style
uncrustify: adapt config to the GtkSourceView coding style

It's hard to find something that suits GtkSourceView.

For example for indent_with_tabs, it should be "1|2", because tabs are
used for the indentation, but for the alignment either tabs or spaces
are used and I don't want to change that. I've filed:
https://sourceforge.net/p/uncrustify/feature-requests/188/

See also:
https://sourceforge.net/p/uncrustify/feature-requests/125/

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