Feature: Easy way to install new tools on agents

[DotNetRussell]

Feature Summary: Users should have a nice interface for installing new tools on agents, seeing what tools are installed, and uninstalling tools from agents. Currently users can install tools by creating a job but this is not the correct use of that interface.

Acceptance Criteria:
Given a user wants to install a new tool on the cluster or modify an existing one
When the user navigates to the settings page
Then the user will be presented with an interface that allows the user to install or delete existing apps in the cluster