Add: Allow GameScript to demolish without a company

This allows GameScripts to shrink towns as well as grow them.

src/command.cpp

@@ -216,7 +216,7 @@ static const Command _command_proc_table[] = {
 	DEF_CMD(CmdRemoveRailroadTrack,                     CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_REMOVE_RAILROAD_TRACK
 	DEF_CMD(CmdBuildSingleRail,          CMD_NO_WATER | CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_SINGLE_RAIL
 	DEF_CMD(CmdRemoveSingleRail,                        CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_REMOVE_SINGLE_RAIL
-	DEF_CMD(CmdLandscapeClear,                                 0, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_LANDSCAPE_CLEAR
+	DEF_CMD(CmdLandscapeClear,                         CMD_DEITY, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_LANDSCAPE_CLEAR
 	DEF_CMD(CmdBuildBridge,  CMD_DEITY | CMD_NO_WATER | CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_BRIDGE
 	DEF_CMD(CmdBuildRailStation,         CMD_NO_WATER | CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_RAIL_STATION
 	DEF_CMD(CmdBuildTrainDepot,          CMD_NO_WATER | CMD_AUTO, CMDT_LANDSCAPE_CONSTRUCTION), // CMD_BUILD_TRAIN_DEPOT

src/script/api/ai_changelog.hpp

@@ -35,6 +35,9 @@
  * \li AIEngine::HasPowerOnRoad
  * \li AIRoadTypeList::RoadTypeList
  *
+ * Other changes:
+ * \li AITile::DemolishTile works without a selected company
+ *
  * \b 1.9.0
  *
  * API additions:

src/script/api/script_tile.cpp

@@ -262,7 +262,6 @@
 
 /* static */ bool ScriptTile::DemolishTile(TileIndex tile)
 {
-	EnforcePrecondition(false, ScriptObject::GetCompany() != OWNER_DEITY);
 	EnforcePrecondition(false, ::IsValidTile(tile));
 
 	return ScriptObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);

src/script/api/script_tile.hpp

@@ -445,7 +445,6 @@ public:
 	 * Destroy everything on the given tile.
 	 * @param tile The tile to demolish.
 	 * @pre ScriptMap::IsValidTile(tile).
-	 * @game @pre Valid ScriptCompanyMode active in scope.
 	 * @exception ScriptError::ERR_AREA_NOT_CLEAR
 	 * @return True if and only if the tile was demolished.
 	 */