Since cargo-deb builds all members of the workspace by default, it is
necessary that the winpty subcrate can be built on all operating
systems, since it's not possible to have OS-specific workspace members.
To achieve this the crate has been changed to be empty by default on
non-windows systems. It might make sense to do something similar with
winpty-sys, but it's not strictly necessary at this point since we don't
directly depend on it.
This fixes#1716.
Initial support for Windows is implemented using the winpty translation
layer. Clipboard support for Windows is provided through the `clipboard`
crate, and font rasterization is provided by RustType.
The tty.rs file has been split into OS-specific files to separate
standard pty handling from the winpty implementation.
Several binary components are fetched via build script on windows
including libclang and winpty. These could be integrated more directly
in the future either by building those dependencies as part of the
Alacritty build process or by leveraging git lfs to store the artifacts.
Fixes#28.
