Vendor dependencies

Let's see how I like this workflow.

vendor/tui/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"
+rust-version = "1.56.1"
+name = "tui"
+version = "0.19.0"
+authors = ["Florian Dehau <work@fdehau.com>"]
+exclude = [
+    "assets/*",
+    ".github",
+    "Makefile.toml",
+    "CONTRIBUTING.md",
+    "*.log",
+    "tags",
+]
+autoexamples = true
+description = """
+A library to build rich terminal user interfaces or dashboards
+"""
+documentation = "https://docs.rs/tui/0.19.0/tui/"
+readme = "README.md"
+keywords = [
+    "tui",
+    "terminal",
+    "dashboard",
+]
+license = "MIT"
+repository = "https://github.com/fdehau/tui-rs"
+resolver = "2"
+
+[[example]]
+name = "barchart"
+required-features = ["crossterm"]
+
+[[example]]
+name = "block"
+required-features = ["crossterm"]
+
+[[example]]
+name = "canvas"
+required-features = ["crossterm"]
+
+[[example]]
+name = "chart"
+required-features = ["crossterm"]
+
+[[example]]
+name = "custom_widget"
+required-features = ["crossterm"]
+
+[[example]]
+name = "gauge"
+required-features = ["crossterm"]
+
+[[example]]
+name = "layout"
+required-features = ["crossterm"]
+
+[[example]]
+name = "list"
+required-features = ["crossterm"]
+
+[[example]]
+name = "panic"
+required-features = ["crossterm"]
+
+[[example]]
+name = "paragraph"
+required-features = ["crossterm"]
+
+[[example]]
+name = "popup"
+required-features = ["crossterm"]
+
+[[example]]
+name = "sparkline"
+required-features = ["crossterm"]
+
+[[example]]
+name = "table"
+required-features = ["crossterm"]
+
+[[example]]
+name = "tabs"
+required-features = ["crossterm"]
+
+[[example]]
+name = "user_input"
+required-features = ["crossterm"]
+
+[dependencies.bitflags]
+version = "1.3"
+
+[dependencies.cassowary]
+version = "0.3"
+
+[dependencies.crossterm]
+version = "0.25"
+optional = true
+
+[dependencies.serde]
+version = "1"
+features = ["derive"]
+optional = true
+
+[dependencies.termion]
+version = "1.5"
+optional = true
+
+[dependencies.unicode-segmentation]
+version = "1.2"
+
+[dependencies.unicode-width]
+version = "0.1"
+
+[dev-dependencies.argh]
+version = "0.1"
+
+[dev-dependencies.rand]
+version = "0.8"
+
+[features]
+default = ["crossterm"]
+
+[badges]