Rename Hurl to hurl for consistency

src/hulk/hulk.d

@@ -41,7 +41,7 @@ void hulk_start()
     cli();
     gdt.initialize();
     idt.initialize();
-    Hurl.initialize();
+    hurl.initialize();
     fb.initialize(cast(uint *)HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, hulk_header.bootinfo.fb.width, hulk_header.bootinfo.fb.height, hulk_header.bootinfo.fb.stride);
     console.initialize();
     console.clear();