MxDirect3D (#114)

* MxDirect3D Constructor

* Implement MxDirect3D::Clear (not yet matching)

* Match MxDirect3D::Clear

* Building out MxDirect3D, link dxguid, add size asserts

* Move a few things around on the Enumerate context obj

* remove dupe mxdirect3d

* Match BuildErrorString and _DoEnumerate

* Fix style

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>
Co-authored-by: disinvite <disinvite@users.noreply.github.com>

LEGO1/mxdirectdraw.cpp

@@ -1,8 +1,8 @@
-
 #include "mxdirectdraw.h"
 #include "decomp.h"
 
 DECOMP_SIZE_ASSERT(MxDirectDraw, 0x880);
+DECOMP_SIZE_ASSERT(MxDirectDraw::DeviceModesInfo, 0x17c);
 
 #ifndef DDSCAPS_3DDEVICE
 #define DDSCAPS_3DDEVICE 0x00002000l
@@ -30,6 +30,12 @@ void EnableResizing(HWND hwnd, BOOL flag)
   }
 }
 
+// OFFSET: LEGO1 0x1009efb0
+MxDirectDraw::DeviceModesInfo::DeviceModesInfo()
+{
+  memset(this, 0, sizeof(*this));
+}
+
 // OFFSET: LEGO1 0x1009EFD0
 MxDirectDraw::DeviceModesInfo::~DeviceModesInfo()
 {