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

game/kernel/kprint.cpp

@@ -884,6 +884,8 @@ s32 format_impl(uint64_t* args) {
                 call_method_of_type(in, type, GOAL_PRINT_METHOD);
               }
             } else {
+              // TODO - if we can't throw exceptions, what is the option?
+              // log, break and continue?
               throw std::runtime_error("failed to find symbol in format!");
             }
           }