Support quoted tilde expansion

[flexatone]

$ fetter -e python3 unpack-count -p wcwidth-0.2.13
Package         Site                                                           Files  Dirs  
wcwidth-0.2.13  /Users/ariza/.env311-fetter-test/lib/python3.11/site-packages  19     2  

[flexatone]

I cannot reproduce this:

{.env311-fetter-test}{78/tilde} % cargo run -- -e "python3" unpack-count -p wcwidth-0.2.13
Package         Site                                                Files  Dirs  
wcwidth-0.2.13  ~/.env311-fetter-test/lib/python3.11/site-packages  19     2     

[flexatone]

Quoted tilde's are not expanded to home dirs:

This fails:

{.env311-fetter-test}{78/tilde} % cargo run -- -e "~/.env311-ff/bin/python3" unpack-count -p wcwidth-0.2.13
Failed to execute command with "/.env311-ff/bin/python3": No such file or directory (os error 2)

But this works:

{.env311-fetter-test}{78/tilde} % cargo run -- -e ~/.env311-ff/bin/python3 unpack-count -p wcwidth-0.2.13
Package         Site                                       Files  Dirs  
wcwidth-0.2.13  ~/.env311-ff/lib/python3.11/site-packages  19     2