Add a Console device and start refactoring screen output.

Kernel/Console.cpp

@@ -0,0 +1,40 @@
+#include "Console.h"
+#include "VGA.h"
+
+static Console* s_the;
+
+Console& Console::the()
+{
+    return *s_the;
+}
+
+Console::Console()
+{
+    s_the = this;
+}
+
+Console::~Console()
+{
+}
+
+ssize_t Console::read(byte* buffer, size_t bufferSize)
+{
+    // FIXME: Implement reading from the console.
+    //        Maybe we could use a ring buffer for this device?
+    //        A generalized ring buffer would probably be useful.
+    return 0;
+}
+
+extern int kprintfFromConsole(const char*, ...);
+
+ssize_t Console::write(const byte* data, size_t size)
+{
+    if (!size)
+        return 0;
+    
+    for (size_t i = 0; i < size; ++i) {
+        kprintfFromConsole("%c", data[i]);
+    }
+    return 0;
+}
+