Add issue templates

This adds issue templates so people can more easily provide everything we need to make something actionable.

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Found a bug? Create a report to help us improve!
+title: "[BUG] Brief Description Here"
+labels: 'status: needs triage, type: bug'
+assignees: ''
+
+---
+
+## Description
+
+A clear and concise description of what the bug is.
+
+## Reproduction Steps
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+## What You Expected to Happen
+
+A clear and concise description of what you expected to happen.
+
+## What Actually Happened
+
+A clear and concise description of what actually happened.
+
+## Screenshots
+
+If applicable, add screenshots to help explain your problem.
+
+## Your Environment
+
+1. Operating System
+2. Operating System Version
+3. Version of Amethyst
+
+## Additional Context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature-modification-request.md

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+---
+name: Feature Modification Request
+about: Have a suggestion to make an existing feature better? Let us know!
+title: "[FEATURE MODIFICATION] Brief Description Here"
+labels: 'status: needs triage, type: modification'
+assignees: ''
+
+---
+
+## Feature
+
+Which feature would you like to modify?
+
+## Change
+
+What change would you like to make to it?
+
+## Reason
+
+Why do you want to make this change?
+
+## Impact
+
+What impact would this change have? Do you think it would impact more features than just the one being modified?
+
+## Additional Notes
+
+Anything else relevant to add can go here

.github/ISSUE_TEMPLATE/maintenance-request.md

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+---
+name: Maintenance Request
+about: See something that isn't quite a bug, but could be made better? Use this!
+title: "[MAINTENANCE] Brief Description Here"
+labels: 'status: needs triage, type: maintenance'
+assignees: ''
+
+---
+
+## Note
+
+This type of request is for things like `unwrap()`s that snuck into production. They aren't likely to cause problems and aren't really a bug, but should be updated. Other examples include formatting updates, dependency updates, or code simplification. 
+
+## Description
+
+What do you see that needs to be updated? Include a link to the code if possible.
+
+## Reason
+
+Why should this change be made?
+
+## Impact
+
+Do you think this change will have a negative impact on anything else?
+
+## Additional Information
+
+Any extra info you want to add can go here

.github/ISSUE_TEMPLATE/new-feature-request.md

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+---
+name: New Feature Request
+about: Suggest a new feature for this project
+title: "[NEW FEATURE] Title Goes Here"
+labels: 'status: needs triage, type: feature'
+assignees: ''
+
+---
+
+## Description
+
+Please note this is not for modifications to existing features. There is another Issue type for that. This is for proposing something that does not yet exist.
+
+## What problem does this solve? What need does it fill?
+A clear and concise description of what the problem/need is. Ex. I'm frustrated when I lose work due to a lack of auto-save.
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.