A major code update for making the DNA file specification of Freestyle settings

and RNA for it independent of the build flag for enabling Freestyle.  Suggested
by Sergey Sharybin through a code review of the branch.

* Many #ifdef WITH_FREESTYLE blocks were removed to always have Freestyle-specific
DNA file specification and RNA for it built in Blender.  This will allow Freestyle
setting survive even when a non-Freestyle build is used for loading and saving
files.  It is noted that operations are still conditionally built through #ifdef
WITH_FREESTYLE blocks.

* To this end, new blenkernel files BKE_freestyle.h and intern/freestyle.c have
been added.  All API functions in FRS_freestyle_config.h as well as some of those
in FRS_freestyle.h were moved to the new files.  Now the relocated API functions
have BKE_ prefix instead of FRS_.

source/blender/makesrna/intern/rna_action.c

@@ -396,13 +396,11 @@ static void rna_def_dopesheet(BlenderRNA *brna)
 	RNA_def_property_ui_icon(prop, ICON_LAMP_DATA, 0);
 	RNA_def_property_update(prop, NC_ANIMATION | ND_ANIMCHAN | NA_EDITED, NULL);
 	
-#ifdef WITH_FREESTYLE
 	prop = RNA_def_property(srna, "show_linestyles", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "filterflag", ADS_FILTER_NOLINESTYLE);
 	RNA_def_property_ui_text(prop, "Display Line Style", "Include visualization of Line Style related Animation data");
 	RNA_def_property_ui_icon(prop, ICON_BRUSH_DATA, 0); /* FIXME */
 	RNA_def_property_update(prop, NC_ANIMATION | ND_ANIMCHAN | NA_EDITED, NULL);
-#endif
 	
 	prop = RNA_def_property(srna, "show_textures", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "filterflag", ADS_FILTER_NOTEX);