Remap key bindings - Closes #133

[Mathijs-Bakker]

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Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• No compiler errors or warnings

Pull request type

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• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
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Issue Number

Issue Number: #133

Create or search an issue here: Extenject/Issues

What is the current behavior?

• The Zenject "Validate Then Run" menu has a conflict with another Unity key mapping.
• Shift-Command-R

What is the new behavior?

• Shift -Option(Alt)-R

Does this introduce a breaking change?

• Yes
• No

Other information

On which Unity version has this been tested?

• 2020.4 LTS
• 2020.3
• 2020.2
• 2020.1
• 2019.4 LTS
• 2019.3
• 2019.2
• 2019.1
• 2018.4 LTS

Scripting backend:

• Mono
• IL2CPP

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