Summary:
For the electron build, plugins are bundled with the app and loaded from there at launch. The headless version can't require from its binary, so plugins need to be required from another path.
This diff makes the path where bundled plugins are loaded from adjustable via an environment variable: `BUNDLED_PLUGIN_PATH`. If it's set, the plugins are loaded from this path, otherwise we default to the old behaviour of including them from `./defaultPlugins`.
For the headless version we expect the plugins to be in a folder called `plugins` next to the executable. This should later be configurable via an argument passed to the CLI.
Reviewed By: passy
Differential Revision: D13843676
fbshipit-source-id: 04237ae6631b4f2ba56887fe992a56f860724edc
Summary: Moving a couple of build function from `build-release` to `build-utils` so they can be shared between the desktop build process and the headless build process.
Reviewed By: passy
Differential Revision: D13786575
fbshipit-source-id: df0a0da6d9a643e3e1c65470e1e96254e8966dd9
