Please allow programs to take user input from the minibuffer (Windows port)

[aks2161989]

I am using the Windows port of Helix from SourceForge. While I love the editor, I came across two problems when using it for coding:

1. There seems to be no placeholder for the current file. For instance, in Vim I could run the command :!python % and this would run the currently opened Python file in Vim. There seems to be n alternative to the '%' placeholder in Helix, so I need to run run-shell-command python actual-file-name.py which can be really inconvenient.
2. Also, the minibffer fails to run programs that take user input from the console. So it would be great to have a way to get user input, even if it opens a new cmd window

[kirawi]

1. Add command expansions %key{body} #6979
2. [Proposal] Buitin support for Integrated Terminal #1976 (recommendation is to use a multiplexer)