Use vulkan/vulkan_core.h instead of vulkan/vulkan.h

vulkan.h includes platform specific headers that cause non trivial build
overhead. Because vk-bootstrap doesn't make use of any platform specific
API's, it can move over to vulkan_core.h.

This *MAY* break users of the library who were depending on vulkan/vulkan.h
including other headers, like windows.h. But because the benefits outweigh
the drawbacks, it is a good change.

example/triangle.cpp

@@ -5,7 +5,7 @@
 #include <fstream>
 #include <string>
 
-#include <vulkan/vulkan.h>
+#include <vulkan/vulkan_core.h>
 #include <GLFW/glfw3.h>
 
 #include <VkBootstrap.h>

script/generate_dispatch.py

@@ -262,7 +262,7 @@ def get_macro_guard(reqs_collection, command_name):
 info += '// https://github.com/charles-lunarg/vk-bootstrap\n\n'
 
 # # Content
-head = '\n#pragma once\n\n#include <vulkan/vulkan.h>\n\n'
+head = '\n#pragma once\n\n#include <vulkan/vulkan_core.h>\n\n'
 head += 'namespace vkb {\n\n'
 
 def create_dispatch_table(dispatch_type):

src/VkBootstrap.h

@@ -24,7 +24,7 @@
 #include <string>
 #include <system_error>
 
-#include <vulkan/vulkan.h>
+#include <vulkan/vulkan_core.h>
 
 #include "VkBootstrapDispatch.h"
 

src/VkBootstrapDispatch.h

@@ -21,7 +21,7 @@
 
 #pragma once
 
-#include <vulkan/vulkan.h>
+#include <vulkan/vulkan_core.h>
 
 namespace vkb {
 

tests/vulkan_mock.hpp

@@ -8,7 +8,7 @@
 #include <string>
 #include <vector>
 
-#include <vulkan/vulkan.h>
+#include <vulkan/vulkan_core.h>
 
 // Helper function to get the size of a struct given a VkStructureType
 // Hand written, must be updated to include any used struct.