build: Update Vulkan-Headers and VUL to 1.4.310

scripts: Uses generator code from Vulkan-Headers

build: Update Vulkan-Headers and VUL to 1.4.307

build: Update Vulkan-Headers and VUL to 1.4.306

cdl: Better handling for missing settings

Distinguish between unset settings and those set to an empty string.
This mostly affects message_severity, so that an empty string can turn
all messages off. However there's a few messages that have to come out
before the layer settings are read and those can't really be turned off.

build: Update Vulkan-Headers and VUL to 1.4.305

Most changes are copyright updates. grr.

layer_base: Remove TLS caching of device/instance handles

In multi threaded apps the cache for a thread could contain stale
data after another thread calls vkDestroyDevice() or vkDestroyInstance.

build: Update Vulkan-Headers and VUL to 1.4.304

build: Update Vulkan-Headers and VUL to 1.4.303

build: Update Vulkan-Headers and VUL to 1.3.302