LmmsStyle: Remove legacy code
Merge pull request #1399 from diizy/master

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

Transposed form of Linkwitz-Riley
Removed vim-config comment from SampleBuffer.cpp.
Removed vim-config comment from main.cpp.
Removed vim-config comment from ExportProjectDialog.cpp.
Removed vim-config comment from SongEditor.cpp.
Merge pull request #1403 from csimons/vim-comments

Remove personal vim-config comments from source files.
Removing focus from hidden windows upon hiding them.
Setting dialog titles in Title Case.
Setting menu titles in Title Case.
Upon toggling off a window, now attempting to focus SongEditor, then any other visible editors, or finally the parent window if all editors are hidden.
Merge pull request #1414 from csimons/dialog-titles

Adopt "Title Case" for dialog titles and menu text.
Merge pull request #1406 from csimons/unbind-keys

Removing focus from child windows upon hiding them.