Resolve a good chunk of windows compiler warnings

Mostly revolved around the new MSVC check for functions that don't cover all paths (ie. a switch statement without a default case).  It appears to not see an assert as a valid default case.

I switched assert(false) to exceptions in these cases.  I believe this should also abort the program, but will also provide a hopefully useful message?  Hopefully this is an improvement.

Resolves #32

decompiler/Disasm/Register.cpp

@@ -5,6 +5,7 @@
 
 #include "Register.h"
 #include <cassert>
+#include <stdexcept>
 
 ////////////////////////////
 // Register Name Constants
@@ -126,7 +127,7 @@ const char* Register::to_charp() const {
     case Reg::PCR:
       return pcr_to_charp(get_pcr());
     default:
-      assert(false);
+      throw std::runtime_error("Unsupported Register");
   }
 }