Add a few missing #includes

Summary:
MSVC complained about using these template definitions without including
the class definitions explicitly.

Reviewers: rempt

Differential Revision: https://phabricator.kde.org/D255

krita/image/filter/kis_filter_registry.h

@@ -22,6 +22,7 @@
 
 #include <QObject>
 
+#include "kis_filter.h"
 #include "kis_types.h"
 #include "KoGenericRegistry.h"
 

krita/image/generator/kis_generator_registry.h

@@ -21,6 +21,7 @@
 
 #include <QObject>
 
+#include "kis_generator.h"
 #include "kis_types.h"
 #include "KoGenericRegistry.h"
 

krita/libcolor/CMakeLists.txt

@@ -8,7 +8,7 @@ endif ()
 
 kde4_add_library(kritacolor SHARED ${kritacolor_LIB_SRCS} )
 
-target_link_libraries(kritacolor ${QT_QTCORE_LIBRARY} ${kritacolor_EXTRA_LIBRARIES})
+target_link_libraries(kritacolor ${QT_QTCORE_LIBRARY} KF5::KDELibs4Support ${kritacolor_EXTRA_LIBRARIES})
 
 target_link_libraries(kritacolor LINK_INTERFACE_LIBRARIES ${QT_QTCORE_LIBRARY})