[KBM] Add key chords like xcompose or wincompose

[frenchiveruti]

📝 Provide a description of the new feature

It would be nice to have a feature similar to Linux Xcompose or wincompose.

What is the expected behavior of the proposed feature? What is the scenario this would be used?

The expected behavior would be to have similar capabilities as we have with https://github.com/samhocevar/wincompose
It's a great tool that I think should be included with powertoys.

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[ericflores]

I use WinCompose to bypass Windows's lack of support of unicode entry. OSX has unicode support (but I don't use OSX). Linux has perfect unicode support. When I set my programmable keyboard in Linux mode, it can send any unicode character up to 3 code points long and Linux will take it without problems. But Windows cannot do that. However, when I tell my programmable keyboard that I'm using Windows and WinCompose is installed, it works as good as Linux. This is the recommended windows workaround for the keyboards using QMK firmware:

https://beta.docs.qmk.fm/using-qmk/software-features/feature_unicode

I don't like changing the language of my keyboard layout in Windows (to English-International) because if I do it, the behavior of the '/"/`/~ keys change. Remaping is a tiny, unsustainable option for a big problem: Windows is not capable of accepting unicode characters via the keyboard.

Therefore, the ideal solution would be to get Windows 10 updated to year 2020 and make it support the entry of unicode like the Linux and OSX do. In the meantime, WinCompose serves as a stopgap. Using WinCompose I can send U+1F1FA, U+1F1F8 with a single key (the USA flag). I'm not sure that this is possible with the keyboard manager.

The reason that I want this in an official PowerToys is that WinCompose is not signed.

[enricogior]

Duplicate of #4508