unused WRITERFILTER_RESOURCEMODEL_DLLPUBLIC

Change-Id: Ia09cd8738e7bfbb942690efb193c0de30e93f69c
writerfilter: unused SubSequence class

Change-Id: Ib52309202714e67af78ef5a47f519779d849931c
writerfilter: unused Exception class

Change-Id: I127ef1183a2c146471668680965fa3d72f6a8f81