FR: make defaults configurable not changing package files

[kuvaldini]

something like /etc/pyqtmaterial.conf:

default_font = Hack
fonts_path = system    ## i.e. /usr/share/fonts/
fonts_path = embedded  ## i.e. Path(__file__).parent/"fonts"
default_theme = system ## autodetect dark/light and accent color from desktop shell (kde,gtk)
default_anything

additional question

does qt_material use css styling? if so may we expose some overrides to `/etc/pyqtmaterial.css`?