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

graphics/event_objects/palettes/field_object_palette_25.pal

@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+115 197 164
+213 213 255
+197 197 230
+156 156 189
+82 82 115
+164 164 197
+131 131 164
+57 57 90
+131 131 164
+82 82 115
+41 41 74
+106 106 139
+74 74 106
+24 24 57
+255 255 255
+0 0 32