Move gfx out of data

graphics/map_preview/pokemon_mansion_pal.pal

@@ -0,0 +1,35 @@
+JASC-PAL
+0100
+32
+255 255 0
+106 115 131
+213 164 180
+180 131 148
+238 189 205
+230 238 213
+115 82 131
+172 180 172
+131 139 139
+205 213 205
+238 213 238
+238 238 205
+230 222 189
+246 238 164
+222 213 139
+246 246 255
+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