Previously, tests would always be enabled if the repo was the top
level project, which isn't desireable for users. This alters the logic
to, by default, only enabling tests when its a top level project, but
still allowing users to *not* enable tests by setting VK_BOOTSTRAP_TEST
to off.
find_package is used to try to find the Vulkan-Headers, and if they aren't
present, it downloads them with fetch content. This way users don't need
vulkan 'installed' on their system, specifically for windows users.
It also changes the tests to load all the necessary function pointers, that
way we don't need to find the vulkan loader to build the tests.
Make vk-bootstrap capable of loading the vulkan runtime and not need to
link against the library. This improves the usability of vk-bootstrap since
now you don't need the vulkan library on your system to build.
This commit also changes how SystemInfo works so as to allow the dynamic
vulkan loading.
SystemInfo will be the way for users to know what is and isn't available on their system.
Currently, it only has booleans for if validation layers and debug messenger are available,
but more could be added in the future.
Now there is a concise example of the library in use all the way to presenting.
Needs to be rewritten to remove exceptions, but for first pass its good enough.
Library contains barebones implementations for simplified
Instance creation
Physical Device selection
Device creation
Swapchain Creation/Recreation
Much of the repo is WIP, and there is little to no testing.
Also, while a single header file is desired for the future, currently
it is structured more like a normal project with .cpp files
