Stage 1 of rename

TODO: re-enable glave build, advance API for glave

v2: get rid of outdated code in tri introduced by rebase
    rename wsi_null.c (olv)
diff --git a/icd/common/icd-instance.h b/icd/common/icd-instance.h
index 43f3179..9b7093c 100644
--- a/icd/common/icd-instance.h
+++ b/icd/common/icd-instance.h
@@ -1,5 +1,5 @@
 /*
- * XGL
+ * Vulkan
  *
  * Copyright (C) 2014-2015 LunarG, Inc.
  *
@@ -36,7 +36,7 @@
 #endif
 
 struct icd_instance_logger {
-    XGL_DBG_MSG_CALLBACK_FUNCTION func;
+    VK_DBG_MSG_CALLBACK_FUNCTION func;
     void *user_data;
 
     struct icd_instance_logger *next;
@@ -49,21 +49,21 @@
     bool break_on_error;
     bool break_on_warning;
 
-    XGL_ALLOC_CALLBACKS alloc_cb;
+    VK_ALLOC_CALLBACKS alloc_cb;
 
     struct icd_instance_logger *loggers;
 };
 
-struct icd_instance *icd_instance_create(const XGL_APPLICATION_INFO *app_info,
-                                         const XGL_ALLOC_CALLBACKS *alloc_cb);
+struct icd_instance *icd_instance_create(const VK_APPLICATION_INFO *app_info,
+                                         const VK_ALLOC_CALLBACKS *alloc_cb);
 void icd_instance_destroy(struct icd_instance *instance);
 
-XGL_RESULT icd_instance_set_bool(struct icd_instance *instance,
-                                 XGL_DBG_GLOBAL_OPTION option, bool yes);
+VK_RESULT icd_instance_set_bool(struct icd_instance *instance,
+                                 VK_DBG_GLOBAL_OPTION option, bool yes);
 
 static inline void *icd_instance_alloc(const struct icd_instance *instance,
                                        size_t size, size_t alignment,
-                                       XGL_SYSTEM_ALLOC_TYPE type)
+                                       VK_SYSTEM_ALLOC_TYPE type)
 {
     return instance->alloc_cb.pfnAlloc(instance->alloc_cb.pUserData,
             size, alignment, type);
@@ -75,16 +75,16 @@
     instance->alloc_cb.pfnFree(instance->alloc_cb.pUserData, ptr);
 }
 
-XGL_RESULT icd_instance_add_logger(struct icd_instance *instance,
-                                   XGL_DBG_MSG_CALLBACK_FUNCTION func,
+VK_RESULT icd_instance_add_logger(struct icd_instance *instance,
+                                   VK_DBG_MSG_CALLBACK_FUNCTION func,
                                    void *user_data);
-XGL_RESULT icd_instance_remove_logger(struct icd_instance *instance,
-                                      XGL_DBG_MSG_CALLBACK_FUNCTION func);
+VK_RESULT icd_instance_remove_logger(struct icd_instance *instance,
+                                      VK_DBG_MSG_CALLBACK_FUNCTION func);
 
 void icd_instance_log(const struct icd_instance *instance,
-                      XGL_DBG_MSG_TYPE msg_type,
-                      XGL_VALIDATION_LEVEL validation_level,
-                      XGL_BASE_OBJECT src_object,
+                      VK_DBG_MSG_TYPE msg_type,
+                      VK_VALIDATION_LEVEL validation_level,
+                      VK_BASE_OBJECT src_object,
                       size_t location, int32_t msg_code,
                       const char *msg);