Install plugin from CLI (#304)

* add install command

* cargo fmt

* filter spec files

* Update src/cli/plugin.rs

Co-Authored-By: Lucien Greathouse <me@lpghatguy.com>

* Update src/cli/plugin.rs

Co-Authored-By: Lucien Greathouse <me@lpghatguy.com>

* fix comments

* encode plugin with rbx_binary

* update build script

* refactor pathbuf error into io error

* fix rojo typo

* remove snafu

* Update `snapshot_from_fs_path`

* Print `rerun-if-changed` even for directories, in order to run the
  build.rs script when files are added.

* Switch `filter_map` loop to a regular for loop. I like the FP-style
  iterator stuff in Rust, but I think Result handling is easier in a
  normal loop. Also, I don't believe the result of read_dir implements
  `ExactSizedIterator`, so some of the wins of map+collect aren't there.

* Replace Result::unwrap with ? in build.rs

* Simplify error handling code in runtime

* Checkout with submodules

Co-authored-by: Lucien Greathouse <me@lpghatguy.com>

Cargo.toml

@@ -62,6 +62,7 @@ memofs = { version = "0.1.1", path = "memofs" }
 
 anyhow = "1.0.27"
 backtrace = "0.3"
+bincode = "1.2.1"
 crossbeam-channel = "0.4.0"
 csv = "1.1.1"
 env_logger = "0.7.1"
@@ -84,6 +85,7 @@ regex = "1.3.1"
 reqwest = "0.9.20"
 ritz = "0.1.0"
 rlua = "0.17.0"
+roblox_install = "0.2.2"
 serde = { version = "1.0", features = ["derive", "rc"] }
 serde_json = "1.0"
 structopt = "0.3.5"
@@ -95,6 +97,13 @@ uuid = { version = "0.8.1", features = ["v4", "serde"] }
 [target.'cfg(windows)'.dependencies]
 winreg = "0.6.2"
 
+[build-dependencies]
+memofs = { version = "0.1.0", path = "memofs" }
+
+anyhow = "1.0.27"
+bincode = "1.2.1"
+maplit = "1.0.1"
+
 [dev-dependencies]
 rojo-insta-ext = { path = "rojo-insta-ext" }