Windows port: adapt the mem viewer to the new tool system. And its layout

has been slightly changed:
- a combobox has been added to let you choose the CPU
- the view mode radiobuttons became a combobox due to space lacking,
- the Close button has been moved to the bottom-right corner
- the view box is less wide due to the font changed to Courier New

You can now open as many mem view windows as you want. Don't abuse it though, 
at least until we find a super-fast refreshing method. For now the tools will
refresh every 6 frames.

Little extra for zeromus: if font antialiasing is turned off, the font the 
view box uses will not be antialiased.

(sorry for blank log message in last revision. The log message I forgot to add was this one.)

desmume/src/windows/resource.h

@@ -336,12 +336,14 @@
 #define IDC_AUTO_UPDATE_SECS            1011
 #define IDC_USEEXTFIRMWARE              1011
 #define IDC_WINDOW2X                    1011
+#define IDC_CPU                         1011
 #define IDC_FIRMWARE                    1012
 #define IDC_RAWDUMP                     1012
 #define IDC_REFRESH                     1012
 #define IDC_WINDOW3X                    1012
 #define IDC_EDIT02                      1013
 #define IDC_WINDOW4X                    1013
+#define IDC_VIEWMODE                    1013
 #define IDC_EDIT04                      1014
 #define IDC_FIRMWAREBROWSE              1014
 #define IDC_BGMAP_CHARBASE              1016