(svn r11399) -Feature(ette): transparency settings can now be saved and thus remembered.

-Codechange: Wrap all transparency settings in accessors, hiding the implementation
-Change: Clicking "transparent building" menu will toggle Houses And Trees only.  The other options can be used in the transparency gui.
Initial patch by Smatz (FS#1349), with some rework by BigBB and your humble servant.

projects/openttd.vcproj

@@ -684,6 +684,9 @@
 			<File
 				RelativePath=".\..\src\train.h">
 			</File>
+			<File
+				RelativePath=".\..\src\transparency.h">
+			</File>
 			<File
 				RelativePath=".\..\src\transparency_gui.h">
 			</File>

projects/openttd_vs80.vcproj

@@ -1143,6 +1143,10 @@
 				RelativePath=".\..\src\train.h"
 				>
 			</File>
+			<File
+				RelativePath=".\..\src\transparency.h"
+				>
+			</File>
 			<File
 				RelativePath=".\..\src\transparency_gui.h"
 				>