SCSS module system support

we don't specify function customness anymore

they can come imports out of modules

2.3.10

add backdrop-filter

2.3.9

fix #57 add selectors symbol list

2.3.8

fix #56 remove useless symbol excludes

2.3.7

also pass most tests from the css package

2.3.6

fix #52 { } and ; are invalid in sass

2.3.5

grid minmax and repeat completions

2.3.4

fix #42 match property-values in lists

2.3.3

fix #51 unquoted strings in parameters

2.3.2

some general minor cleanup