misc changes, part ?/? (#441)

* gui: add option to boot a game by choosing elf file

* core: some small implementations

* fs: implement open func

* add some validations

* spirv: add image format

* video_core: add eR16Uint to formats

src/video_core/renderer_vulkan/liverpool_to_vk.cpp

@@ -329,6 +329,7 @@ std::span<const vk::Format> GetAllFormats() {
         vk::Format::eR16G16Sint,
         vk::Format::eR16G16Snorm,
         vk::Format::eR16Sfloat,
+        vk::Format::eR16Uint,
         vk::Format::eR16Unorm,
         vk::Format::eR32G32B32A32Sfloat,
         vk::Format::eR32G32B32A32Sint,