grim/guifications2

Noticed that I forgot to get the x11 and win32 specific display files into the cmake build, so moved them into src/ and added them depending on the target
src/gf_action.c
src/gf_blist.c
src/gf_display.c
src/gf_event.c
src/gf_event_info.c
src/gf_item.c
src/gf_item_icon.c
src/gf_item_image.c
src/gf_item_offset.c
src/gf_item_text.c
src/gf_menu.c
src/gf_notification.c
src/gf_preferences.c
src/gf_stock.c
src/gf_theme.c
src/gf_theme_editor.c
src/gf_theme_info.c
src/gf_theme_ops.c
src/guifications.c