Should fix#34, when NVIDIA card provides memory type with several
addional flags more than code has asked but retuns error on allocate.
Code has be changed to use first memory type with minimal prefered
properties.
E.g. if code needs VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, a first block should be used
instead a fourth as before:
```
Memory blocks:
1: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT
2: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
3: VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT VK_MEMORY_PROPERTY_HOST_COHERENT_BIT VK_MEMORY_PROPERTY_HOST_CACHED_BIT
4: VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
```
The easiest way to build this is to check out the dhewm3-libs project
(https://github.com/dhewm/dhewm3-libs/) to provide the dependencies
(SDL2, OpenAL, cURL) and set YQUAKE2LIBS accordingly, by passing
-DYQUAKE2LIBS=c:/path/to/dhewm3-libs/i686-w64-mingw32 to cmake.
I wouldn't really recommend building with MSVC - I just somehow made it
work and ignored all the warnings and I have no idea how portable the
resulting binaries are etc. For binaries you actually want to use, please
continue using MinGW-w64. Especially my workaround for VLAs (C99 variable
length arrays) is kinda fishy, particularly if those arrays are allocated
in a loop (that's inly done in ref_gl1.dll's code).
The only reason I did this is that I had to debug on Windows and, at least
for my specific bug, gdb didn't really work with binaries produced by
MingGW-w64 and MSVC's debugger works well with binaries produced by MSVC.
Currently requires VS 2019 16.8 or newer with C11 (/std:c11) because I
couldn't get YQ2_ALIGNAS_TYPE() to work with MSVC without _Alignas().
If we can get this to work, VS2015 or newer might suffice (but not older
versions, because their so called C standardlib didn't provide exotic
functions like snprintf()).
# Conflicts:
# CMakeLists.txt
Added checks for:
```
Memory types must not have both VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT
and VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT set.
```
And
```
A memory type with this flag set is only allowed to be bound to a VkImage
whose usage flags include VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT.
```
https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkMemoryPropertyFlagBits.html
- vk_molten_metalbuffers: enable/disable Metal buffers to bind textures
more efficiently (>= Big Sur).
- vk_molten_fastmath: enable/disable float point op optimisations.
When the validation layers fails (or not present) then we "surprisingly"
fallback to a GL renderer losing all settings too.
Here we try to create the instance but without the validation part then.
