Vendor dependencies

Let's see how I like this workflow.

vendor/crossterm/Cargo.toml

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+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+name = "crossterm"
+version = "0.25.0"
+authors = ["T. Post"]
+exclude = [
+    "target",
+    "Cargo.lock",
+]
+description = "A crossplatform terminal library for manipulating terminals."
+documentation = "https://docs.rs/crossterm/"
+readme = "README.md"
+keywords = [
+    "event",
+    "color",
+    "cli",
+    "input",
+    "terminal",
+]
+categories = [
+    "command-line-interface",
+    "command-line-utilities",
+]
+license = "MIT"
+repository = "https://github.com/crossterm-rs/crossterm"
+resolver = "2"
+
+[package.metadata.docs.rs]
+all-features = true
+
+[lib]
+name = "crossterm"
+path = "src/lib.rs"
+
+[[example]]
+name = "event-read"
+required-features = ["bracketed-paste"]
+
+[[example]]
+name = "event-stream-async-std"
+required-features = ["event-stream"]
+
+[[example]]
+name = "event-stream-tokio"
+required-features = ["event-stream"]
+
+[dependencies.bitflags]
+version = "1.3"
+
+[dependencies.futures-core]
+version = "0.3"
+optional = true
+default-features = false
+
+[dependencies.parking_lot]
+version = "0.12"
+
+[dependencies.serde]
+version = "1.0"
+features = ["derive"]
+optional = true
+
+[dev-dependencies.async-std]
+version = "1.10"
+
+[dev-dependencies.futures]
+version = "0.3"
+
+[dev-dependencies.futures-timer]
+version = "3.0"
+
+[dev-dependencies.serde_json]
+version = "1.0"
+
+[dev-dependencies.tokio]
+version = "1.16"
+features = ["full"]
+
+[features]
+bracketed-paste = []
+default = ["bracketed-paste"]
+event-stream = ["futures-core"]
+
+[target."cfg(unix)".dependencies.libc]
+version = "0.2"
+
+[target."cfg(unix)".dependencies.mio]
+version = "0.8"
+features = ["os-poll"]
+
+[target."cfg(unix)".dependencies.signal-hook]
+version = "0.3.13"
+
+[target."cfg(unix)".dependencies.signal-hook-mio]
+version = "0.2.3"
+features = ["support-v0_8"]
+
+[target."cfg(windows)".dependencies.crossterm_winapi]
+version = "0.9"
+
+[target."cfg(windows)".dependencies.winapi]
+version = "0.3.9"
+features = [
+    "winuser",
+    "winerror",
+]