flightlessmango/MangoHud v0.8.4 on GitHub

Fixes

fixed Steam Overlay coexistence due to Vulkan layer procaddr/trampolining issues
fixed dx_api always showing dx? for DX9/11, also added DX3-7
fixed imgui static library being installed unexpectedly
vulkan: removed redundant instance dispatch table reload
vulkan: fixed loader procaddr forwarding
vulkan: exported Vulkan layer negotiation entrypoint