Update issue templates

Adds Legality, crash, and feature request templates.

.github/ISSUE_TEMPLATE/bug-report--non-legality-.md

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+---
+name: Bug report (non-Legality)
+about: Create a report to help us fix a crash / incorrect behavior
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+Note: Requesting new editing features that *require research* are not Feature Requests. This is only for improving interactions and/or leveraging the current code in new/interesting ways.
+
+**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.

.github/ISSUE_TEMPLATE/legality-parsing-report.md

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+---
+name: Legality parsing report
+about: Legality check returned an unexpected result
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the problem**
+A clear and concise description of what the bug is. This is not to ask why fabricated data does not pass the legality check.
+
+**To Reproduce**
+Please provide a PKM file or adequate information so that we may quickly replicate the parsing behavior on our end.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.