Feature: add buildozer wizard (#80)

* Add buildozer component
* Refactor with ConfigurationContext to remove dependency on Container.file global state.
* Refactor such that WORKSPACE file is optional.
* Refactor as LaunchableComponent
* Add documentation

Author: pcj

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Change Log
 
+## 1.4.0 (Nov 4 2021)
+
+- Add buildozer wizard.
+- Add buildozer component.
+- Update buildtools to 4.2.3
 ## 1.3.0 (Oct 23 2021)
 
 - Add starlark debug launch support.

docs/formatting.md

@@ -23,3 +23,21 @@ To format BUILD files on every save, add the following to your settings.json `>
     "editor.formatOnSave": true
 }
 ```
+
+## Build File Editing/Rewriting
+
+The
+[buildozer](https://github.com/bazelbuild/buildtools/blob/4a3d3f3ff787e3fb7a92d7cceba09c7fe4b71ce4/buildozer/README.md)
+command is included.
+
+Despite buildozer's usefulness (when you need it), it can be challenging to
+remember the command syntax.  A "wizard" command is available
+(`shift+ctrl+cmd+p` or `bsv.buildozer.wizard`) that can help you construct a
+buildozer command.  This will prompt you though the various command arguments,
+and run the command in a terminal.
+
+Once you have built an initial buildozer command, it will likely be easier to
+simply iterate on it within the terminal itself, rather than re-running the
+wizard.
+
+<img width="1193" alt="Screen Shot 2021-11-07 at 10 16 38 AM" src="https://user-images.githubusercontent.com/50580/140654870-fd2fcba3-0a2a-4537-a32b-cf1d59defd00.png">