[reaction] Add new port

[lumia431]

• Changes comply with the maintainer guide.
• The name of the port matches an existing name for this component on https://repology.org/ if possible, and/or is strongly associated with that component on search engines.
• Optional dependencies are resolved in exactly one way. For example, if the component is built with CMake, all find_package calls are REQUIRED, are satisfied by vcpkg.json's declared dependencies, or disabled with CMAKE_DISABLE_FIND_PACKAGE_Xxx.
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is accurate. See adding-usage for context.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is in the new port's versions file.
• Only one version is added to each modified port's versions file.

[lumia431]

@microsoft-github-policy-service agree

[dg0yt]

This should be done by the CMake project.

[lumia431]

Thanks, removed

[dg0yt]

Why does the bin directory even exist?

[lumia431]

Removed

[dg0yt]

Suggested change

	Example usage:
	#include <reaction.h>
	// Create reactive variables
	auto a = reaction::var(1);
	auto b = reaction::var(2);
	// Create computed values
	auto sum = reaction::calc([]() { return a() + b(); });
	// Values automatically update when dependencies change
	a.value(10); // sum will automatically update to 12

You can add a documentation link to the manifest instead.

[lumia431]

Removed

[dg0yt]

Why are C++20 features restricted to native? My android toolchain may be much newer than my host toolchain.

[lumia431]

Removed

[lumia431]

All done, but CI in x86_windows failed:
PowerShell exited with code '1'.

[JavierMatosD]

It looks like this PR was edited after adding the version database entry. You will have to update the git tree object by running the vcpkg x-add-version reaction --overwrite command. See -> https://learn.microsoft.com/vcpkg/commands/add-version?WT.mc_id=vcpkg_inproduct_cli#--overwrite-version

[lumia431]

@JavierMatosD Thank you, Success.