Import Picking and placing single houses in scenario editor patch

Minor whitespace fixes

http://www.tt-forums.net/viewtopic.php?f=33&t=68894&view=unread#p1099696

src/newgrf_town.h

@@ -31,6 +31,24 @@ struct TownScopeResolver : public ScopeResolver {
 	virtual void StorePSA(uint reg, int32 value);
 };
 
+/**
+ * Fake scope resolver for nonexistent towns.
+ *
+ * The purpose of this class is to provide a house resolver for a given house type
+ * but not an actual house instatntion. We need this when e.g. drawing houses in
+ * GUI to keep backward compatibility with GRFs that were created before this
+ * functionality. When querying house sprites, certain GRF may read various town
+ * variables e.g. the population. Since the building doesn't exists and is not
+ * bounded to any town we have no real values that we can return. Instead of
+ * failing, this resolver will return fake values.
+ */
+struct FakeTownScopeResolver : public ScopeResolver {
+	FakeTownScopeResolver(ResolverObject &ro) : ScopeResolver(ro)
+	{ }
+
+	virtual uint32 GetVariable(byte variable, uint32 parameter, bool *available) const;
+};
+
 /** Resolver of town properties. */
 struct TownResolverObject : public ResolverObject {
 	TownScopeResolver town_scope; ///< Scope resolver specific for towns.