Support cp something ~/.bin

[certik]

~/repos/shell$ cp target/release/shell.exe ~/bin
cp: could not copy target/release/shell.exe to ~/bin: The system cannot find the path specified. (os error 3)

The ~/bin does not work.

[certik]

Same with ls, rm and also launching programs using ~/bin/shell.exe

[wolfv]

I think this relates to the idea of pre-processing the ~ string and expanding it to $HOME.

[certik]

Note that there is no $HOME on Windows, but shell already knows how to get it via deno's dirs::home_dir(), which is a package.

[certik]

This now works, it was fixed in #85.