Rebrand 'map object' and 'field object' to 'event object'

graphics/event_objects/palettes/field_object_palette_24.pal

@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+115 197 164
+213 213 222
+197 197 197
+156 156 156
+82 82 82
+164 164 164
+131 131 131
+57 57 57
+131 131 131
+82 82 82
+41 41 41
+106 106 106
+74 74 74
+24 24 24
+255 255 255
+0 0 0