Fixed small annoyance that when a top level @at rule had no immediate rules (e.g. it just used to serve as the base for nested @ats inside itself, it would still create an empty @at-rule {} block in the output. Now if it has no contents it doesn't.
Refactored the @media bits of the parser and output modules to accommodate @page and @supports in the same functions
@pageand@supportsat rules.@atrule had no immediate rules (e.g. it just used to serve as the base for nested@ats inside itself, it would still create an empty@at-rule {}block in the output. Now if it has no contents it doesn't.@mediabits of the parser and output modules to accommodate@pageand@supportsin the same functions