Customizable launcher component

[BrianS111]

This is a draft PR for https://github.com/relaycc/receiver/issues/52

Note: Pull requests which don't include the minimum details specified in this template will probably be closed out-of-hand.

Issue Link or Description (the "what" and "why")

• Links to GitHub issues that this PR closes (if there's no issues to link, a detailed description must be included).
• The issues and description should provide a detailed, high-level overview of the changes included in the PR.
• Include a description of "why" the change is necessary. If it's a bug fix, describe the bug. If it's a refactor, describe what the refactor accomplishes.
• Please do not include implementation details in this section.

Implementation Plan

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Implementation Details (the "how")

A detailed description of each change in the changeset. The description should include

• high-level overview of the changes
• where should the reveiwer start their review, which files?
• notes on any hacky solutions that were included
• any pieces left unfinished and why

How the changeset was tested

A detailed list of cases which the author verified before requesting review.

• The ideal option here is a list of existing, updated, or newly-created UI tests that cover the included functionality.
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Changes were verified on the following platforms:

• [] Chrome desktop
• [] Firefox desktop
• [] Safari desktop
• [] Chrome Android
• [] MetaMask browser Android
• [] Safari iOS
• [] MetaMask browser iOS

[killthebuddh4]

Closing because it looks inactive.