Don't show tools until repo is selected

[keanelekenns]

Submitting settings when no repo is selected results in an error. Even worse, we will be loading previous settings whenever a repo is selected, which will undo any changes made. Therefore we should not allow users to configure anything until they choose a repo.

I suggest that we start by having a simple message like the one shown in the image above, but in the future we can allow the user to learn about the tools before selecting a repo.

[DerekRobin]

I am not sure if this is needed anymore because as of now, the user has no choice but select a repo before proceeding to the rest of the tool manager.

[keanelekenns]

Yes, I think in light of the new plan, we can scrap this.

[DerekRobin]

This has been changed so that the tools are shown and the user can select a repo at any point during the process.