~mna/snow unlisted

snow/pkg/parser/testdata/empty.snow.want -rw-r--r-- 19 bytes
Merge branch 'wip-post-ast'
pkg: start work on codegen based on semantic
pkg/parser: fix parser test results, import cycle
pkg: move packages down one level
big refactor of compiler package into sub-packages
pkg/compiler: parse function attributes
test some invalid cases
pkg/compiler: more parser tests