Don't prefix with ash::vk::, instead expect a crate named vulkan::

This crate would be the place where either:

1. `ash::vk::*` is reexported;
2. manual reexports are generated from `Vulkan-1.0.gir`;
3. something else.

src/codegen/sys/ffi_type.rs

@@ -150,7 +150,15 @@ fn ffi_inner(env: &Env, tid: library::TypeId, mut inner: String) -> Result {
         | Type::List(..)
         | Type::SList(..)
         | Type::HashTable(..) => fix_name(env, tid, &inner),
-        Type::Custom(ref c) => return Ok(c.name.clone().into()),
+        // TODO: Add namespace!
+        Type::Custom(ref c) => {
+            // return Ok(c.name.clone().into());
+            Ok(format!(
+                "{}::{}",
+                env.namespaces[tid.ns_id].higher_crate_name, c.name
+            )
+            .into())
+        }
         _ => {
             if let Some(glib_name) = env.library.type_(tid).get_glib_name() {
                 if inner != glib_name {

src/library_postprocessing.rs

@@ -53,7 +53,8 @@ impl Library {
             for ns_type in ns.types.iter_mut().flatten() {
                 if let Type::Record(incomplete_record) = ns_type {
                     *ns_type = Type::Custom(Custom {
-                        name: format!("ash::vk::{}", incomplete_record.name),
+                        // name: format!("ash::vk::{}", incomplete_record.name),
+                        name: incomplete_record.name.clone(),
                         conversion_type: ConversionType::Direct,
                     });
                 }