Manage Gauge Plugins via IDE - Installation

[sriv]

Expected behavior

When opening a Gauge project, Intellij-IDEA should look for plugins installed, and prompt users to install plugins that are listed in manifest.json when the project requires plugins that are not installed already.

User consent is required before installation.

Dev Notes

• run gauge --machine-readable -v to get the version information in json format.
• run gauge --install <plugin> to fetch and install required plugin, or alternatively run gauge --install-all (with working directory as the project root) to install all plugins specified in manifest.json.

[zabil]

Also, add syntax, auto completion and parse support for manifest.json to add remove plugins.