Move gfx out of data

graphics/map_preview/seafoam_islands_pal.pal

@@ -0,0 +1,35 @@
+JASC-PAL
+0100
+32
+255 255 0
+65 74 90
+156 222 123
+106 180 98
+197 205 172
+172 172 139
+172 222 164
+222 230 205
+164 230 106
+205 238 197
+131 131 90
+238 230 189
+213 246 255
+164 205 255
+205 230 255
+238 246 255
+255 255 90
+246 246 255
+74 98 123
+213 213 213
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+0 0 0