Moved hot key handling and clipboard impl to crossterm. (#95)

* Move hot key handling and clipboard impl to crossterm

* Add '\r' to error messages that meant to be printed in raw mode

In raw mode, the cursor won't go back to line beginning when '\n' is
printed. A '\r' would mannually reset the error message.

* Try fix Windows build.

* Use windows-sys to minimize Windows dependencies.

* Reuse windows-sys 0.59.0 as other deps.

* Fix Windows syscall convention:

> If the function succeeds, the return value is nonzero.

* Add `Safety` comment to newly added `unsafe` call.

* Replace UNIX `Ctrl+C` handler to use `libc::raise`

* Extract `handle_key_press` into a function.

Author: Jisu-Woniu

Cargo.lock

@@ -35,8 +35,17 @@ tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 walkdir = "2.4.0"
 data-encoding = "2.6.0"
 n0-future = "0.1.2"
-base64 = { version = "0.22.1", optional = true }
 hex = "0.4.3"
+crossterm = { version = "0.29.0", features = [
+  "event-stream",
+  "osc52",
+], optional = true }
+
+[target.'cfg(unix)'.dependencies]
+libc = { version = "0.2.174", optional = true }
+
+[target.'cfg(windows)'.dependencies]
+windows-sys = { version = "0.59.0", features = ["Win32_System_Console"], optional = true }
 
 [dev-dependencies]
 duct = "0.13.6"
@@ -46,7 +55,7 @@ serde_json = "1.0.108"
 tempfile = "3.8.1"
 
 [features]
-clipboard = ["dep:base64"]
+clipboard = ["dep:crossterm", "dep:windows-sys", "dep:libc"]
 default = ["clipboard"]
 
 [patch.crates-io]