Explicitly use Platform Toolset v143 with vcpkg

[Pizzabelly]

I'm not super familiar with Visual Studio, so I might be missing something, but this caused me a headache after installing VS 2022 and 2026 on the same machine. I was facing link errors that stemmed from dependencies compiled with different toolchain versions. From what I could deduce this should be what's necessary for opening the solution and building to "just work" if targeting an older Platform Toolset than the newest version installed on the system. There is a discussion about this problem here microsoft/vcpkg#25905. I don't think removing the x86 target is required but I figure it makes sense because we need the loader DLL to be x64 because the game exe is x64.

[Pizzabelly]

I force pushed to remove the added newlines on the vcxproj files because visual studio also removes a newline at end of file every time it writes them.

[Pizzabelly]

I re-ran vcpkg without these changes so I can post the specific errors.

Severity	Code	Description	Project	File
Error	LNK2001	unresolved external symbol __std_find_last_not_of_trivial_pos_1	mhw-cs-plugin-loader	tinyobjloader.lib(tiny_obj_loader.cc.obj)
Error	LNK2001	unresolved external symbol __std_find_first_not_of_trivial_pos_2	mhw-cs-plugin-loader	libnethost.lib(utils.cpp.obj)