Capitalize namespacing structs

This helps to avoid name clashes when breaking up modules into packages.

src/hulk/klog.d

@@ -7,7 +7,7 @@ import core.stdc.stdarg;
 import hulk.console;
 static import hulk.writef;
 
-struct klog
+struct Klog
 {
     /**
      * Kernel buffer size log.
@@ -40,7 +40,7 @@ struct klog
     public static void writef(string s, va_list args)
     {
         hulk.writef.writef(s, args, function void(ubyte ch) {
-                    console.write(ch);
+                    Console.write(ch);
                 });
     }