First pass at getting Acadia running under bochs.

- Create a bochs build script.
- Properly configure COM1

zion/debug/debug.h

@@ -37,3 +37,9 @@ void panic(const char* str, Args&&... args) {
 #define UNREACHABLE                                                  \
   panic("Unreachable {}, {}", glcr::StringView(__FILE__), __LINE__); \
   __builtin_unreachable();
+
+namespace serial {
+
+void initialize(uint32_t baud_rate);
+
+}