Add dialog allowing you to alter the scenario's graphics sheets from within the scenario editor

- You can copy/paste images into the sheet, or import/export to/from png files

Also:
- Picture controls in the dialog engine have a new "scaled" flag; if set, the picture will be scaled into the provided bounds rather than overflowing. Currently, only full sheets honour the setting.

src/BoE.vsproj/ScenEdit/Scen Editor.rc

@@ -90,6 +90,7 @@ BEGIN
         MENUITEM "&Scenario Details",           IDM_SCEN_DETAILS
         MENUITEM "Scenario Intr&o Text",        IDM_SCEN_INTRO
         MENUITEM "Set Starting &Location",      IDM_SCEN_START
+        MENUITEM "Edit Custom Graphic Sheets",  IDM_SCEN_CUSTOM_SHEETS
         MENUITEM "Classify Custom &Graphics",   IDM_SCEN_CUSTOM_PICS
         MENUITEM SEPARATOR
         MENUITEM "Advanced:",                   IDM_SCEN_NEW_TOWN, GRAYED

src/BoE.vsproj/ScenEdit/scenresource.h

@@ -66,6 +66,7 @@
 #define IDM_EDIT_DELETE                 161
 #define IDM_EDIT_SELECT                 162
 #define IDM_SCEN_CUSTOM_PICS            163
+#define IDM_SCEN_CUSTOM_SHEETS          164
 
 // Next default values for new objects
 // 
@@ -74,6 +75,6 @@
 #define _APS_NEXT_RESOURCE_VALUE        103
 #define _APS_NEXT_COMMAND_VALUE         40014
 #define _APS_NEXT_CONTROL_VALUE         1001
-#define _APS_NEXT_SYMED_VALUE           164
+#define _APS_NEXT_SYMED_VALUE           165
 #endif
 #endif