1. updated colour options

now supports full transparency with #RRGGBBAA syntax, in all of:

• -g, --colour-light (new, the colour of the light part of the termination curve)
• -n, --colour-land (alpha channel now makes main window transparent)
• -o, --colour-ocean
• -u, --colour-sun (new, for --show-sun)

2. added -s, --show-sun to render a sun icon at the subsolar point

3. fixed map sizing issue in #14

packagers: see also v1.1.0 from last week

1. bumped to gkt4, gtk4-layer-shell
2. solar terminator is now directly draw as an SVG path instead of the astro wtab
3. better anti-aliasing for map and solar terminator

Spring Equinox	Summer Solstice
Autumn Equinox	Winter Solstice

hi all,
just added was support for new flags

  -n, --colour-land=COLOUR_LAND
  -o, --colour-ocean=COLOUR_OCEAN

internally the map is now an SVG, so the quality may be slightly better too

⚠️ this is also a breaking change as librsvg 2 is required

thanks!