Revert "sorting with frozen columns"

This reverts commit 2864c9d699df21c783006f9a25bf30c9f7c48cec.
Revert "Update slick.grid.js"

This reverts commit 7ac913f05e73ed152e56bb7a1ae637eaec47b663.
Revert "Initial FreezeColumns implementation"

This reverts commit 904b7b661c18a2b38e5cdd513c91b12e92c817d9.