Ensure that all member attributes are initialized

I ran the game through cppcheck and it spat out a bunch of member
attributes that weren't being initialized. So I initialized them.

In the previous version of this commit, I added constructors to
GraphicsResources, otherlevelclass, labclass, warpclass, and finalclass,
but flibit says this changes the code flow enough that it's risky to
merge before 2.4, so I got rid of those constructors, too.

desktop_version/src/BinaryBlob.cpp

@@ -11,6 +11,7 @@ binaryBlob::binaryBlob()
 {
 	numberofHeaders = 0;
 	SDL_memset(m_headers, 0, sizeof(m_headers));
+	SDL_memset(m_memblocks, 0, sizeof(m_memblocks));
 }
 
 #ifdef VVV_COMPILEMUSIC