Add Action 5 remappable type for misc GUI sprites

docs/newgrf-additions-nml.html

@@ -186,6 +186,12 @@
 			</table>
 		</td>
 	</tr>
+	<tr><td>MISC_GUI</td><td>1</td>
+		<td>
+			<b>Miscellaneous GUI graphics</b>
+			<p>There is currently one misc GUI sprite.</p>
+		</td>
+	</tr>
 	</table>
 	<h3>Signal graphics using switches</h3>
 	<p>

docs/newgrf-additions.html

@@ -478,5 +478,8 @@
 	</table>
 	</p>
 	<p>This is indicated by the feature name: <font face="monospace">action5_no_entry_signals</font>, version 1</p>
+	<h4 id="misc_gui">Miscellaneous GUI graphics (mappable type: misc_gui)</h4>
+	<p>There is currently one misc GUI sprite.</p>
+	<p>This is indicated by the feature name: <font face="monospace">action5_misc_gui</font>, version 1</p>
 </body>
 </html>

src/newgrf_extension.cpp

@@ -28,6 +28,7 @@ extern const GRFFeatureInfo _grf_feature_list[] = {
 	GRFFeatureInfo("action0_bridge_availability_flags", 1),
 	GRFFeatureInfo("action5_programmable_signals", 1),
 	GRFFeatureInfo("action5_no_entry_signals", 1),
+	GRFFeatureInfo("action5_misc_gui", 1),
 	GRFFeatureInfo("action0_railtype_programmable_signals", 1),
 	GRFFeatureInfo("action0_railtype_no_entry_signals", 1),
 	GRFFeatureInfo("action0_railtype_restricted_signals", 1),
@@ -79,5 +80,6 @@ extern const GRFPropertyMapDefinition _grf_action0_remappable_properties[] = {
 extern const Action5TypeRemapDefinition _grf_action5_remappable_types[] = {
 	Action5TypeRemapDefinition("programmable_signals", A5BLOCK_ALLOW_OFFSET, SPR_PROGSIGNAL_BASE, 1, 32, "Programmable pre-signal graphics"),
 	Action5TypeRemapDefinition("no_entry_signals", A5BLOCK_ALLOW_OFFSET, SPR_EXTRASIGNAL_BASE, 1, 16, "No-entry signal graphics"),
+	Action5TypeRemapDefinition("misc_gui", A5BLOCK_ALLOW_OFFSET, SPR_MISC_GUI_BASE, 1, 1, "Miscellaneous GUI graphics"),
 	Action5TypeRemapDefinition(),
 };