Vulkan in fred - #7673
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This commit introduces `gr_end_offscreen_frame()` to manage per-frame state recycling for renders that skip `gr_flip()`. It adds generation-based sub-allocation tracking in `VulkanBuffer` to prevent stale memory access after allocator rewinds. Improves resource management, resolves memory growth issues in non-flipping workflows (e.g., qtFRED briefing map), and ensures consistent handling of uniform segments and descriptor pools. Integrate Vulkan render backend in qtFRED with updated rendering workflows, multi-target support, and enhanced resource lifecycle management.
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Adds vulkan support to qtFRED. Based on #7671 and should be merged after that PR.