LmmsStyle: Remove legacy code
Added 4th-order Linkwitz-Riley filter object to BasicFilters.h
Merge pull request #1399 from diizy/master

Added 4th-order Linkwitz-Riley filter object to BasicFilters.h
Transposed form of Linkwitz-Riley
Merge pull request #1400 from diizy/master

Transposed form of Linkwitz-Riley