Support installation on Windows

[Br1ght0ne]

Close #13.

After testing feature/windows branch locally for some time, I can safely say that it's ready. So I rebased it onto latest master and added a CI job for Windows releases. Hope it helps!

[oppiliappan]

Thanks for your work on this! I have added some bits to conditionally compile with termion on linux and crossterm on windows, (crossterm causes the screen to flash on refresh).

[oppiliappan]

Ah, that wouldn't quite work, rust tries to build cursive with the termion feature on all platforms, even though it doesn't need it on windows. Currently, cfg(target_os = "...") in Cargo.toml is a nightly only feature.

[oppiliappan]

I have updated dijo to now support compile time feature flags, unix for termion and windows for crossterm, but I receive this on completion of CI builds on windows:

    Finished release [optimized] target(s) in 5m 01s
C:\ProgramData\Chocolatey\lib\mingw\tools\install\mingw64\x86_64-w64-mingw32\bin\strip.exe: 'target/release/dijo': No such file
##[error]Process completed with exit code 1.

should this perhaps be target\release\dijo?

[oppiliappan]

should this perhaps be target\release\dijo?

It was target/release/dijo.exe.

I have sort of worked this out by switching to the pancurses backend, the build is working fine with your CI additions!

[Br1ght0ne]

Thanks for figuring it out @NerdyPepper!