(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.

src/settings.cpp

@@ -49,6 +49,7 @@
 #include "fontcache.h"
 #endif
 #include "spritecache.h"
+#include "transparency.h"
 
 /** The patch values that are used for new games and/or modified in config file */
 Patches _patches_newgame;
@@ -1275,6 +1276,7 @@ static const SettingDescGlobVarList _misc_settings[] = {
 #endif
 	  SDTG_VAR("sprite_cache_size",SLE_UINT, S, 0, _sprite_cache_size,     4, 1, 64, 0, STR_NULL, NULL),
 	  SDTG_VAR("player_face",    SLE_UINT32, S, 0, _player_face,      0,0,0xFFFFFFFF,0, STR_NULL, NULL),
+	  SDTG_VAR("transparency_options", SLE_UINT8, S, 0, _transparency_opt, 0, 0,0xFF,0, STR_NULL, NULL),
 	  SDTG_END()
 };