Win build vcpkg

[cboulay]

Updated cmake files to use vcpkg on Windows. Along with this comes updates to dependencies (in progress).

[cboulay]

Working on #608

@HipsterSloth

1. Please take a look at the ImGui related changes to configtool. Their API has changed. I naively tried whatever functions seemed to fit best but it appears there is more to it than that.

2. Similarly, OpenCV has changed. The get(CAP_PROP_FORMAT) no longer returns the values we were depending on. I'll take a look at this.

[cboulay]

@HipsterSloth - Sorry for the noise. It seems like the ImGui changes were mostly done. It was crashing when the service was crashing due to some weird timing issues. I've made some small changes to use the clipboard because the callback signatures changed, and ConfigTool seems to be working properly (in Linux at least, haven't tested Windows). On to the next problem.

[HipsterSloth]

Thanks for all of your work on this so far! Super exciting to get a proper package manager in windows.

I did a sync on this branch so I can help out with any weird compilation issues or crashes you'd like me to look at. Looking over the imgui changes you made those seem right. I'm in the middle of downloading the vcpackages at the moment. It'll likely be tomorrow night that I'll actually be able to compile stuff. Just to make sure I'm setting vcpkg up correctly, this is what I did:

mkdir e:\git-microsoft
cd git-microsoft
git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
bootstrap-vcpkg.bat
vcpkg integrate install
vcpkg install sdl2 libusb opencv boost eigen3 protobuf glm imgui
vcpkg install sdl2 libusb opencv boost eigen3 protobuf glm imgui --triplet x64-windows

Does this look right to you? I had to do the second install because it looks like vcpkg assumes 32-bit by default.

[cboulay]

The first vcpkg install was probably unnecessary. Check out the doc folder.