1) added dark theme with better cross-platform compatibility
2) added more help info
3) structures in map view now respect the selected dimension
4) map tiling is now seamĺess
5) tabulized 48-bit generator options to focus on meaningful settings
6) fixed seed list option of 48-bit generator not applying salt or transpose
7) broken condition references will now keep their reference id
8) the automatically added 4-structure restriction for quad-structures now use a range of 256 instead of 128/160
(this change should reduce confusion caused by non-obvious behavoir when the quad-structure restriction is removed)
