Update issue templates

Initial draft of a bug report template to address common follow-up questions.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+Thank you for reporting an issue.
+
+Before reporting a bug, **please make sure that you are running the latest version.**
+You can get the latest version number from `CHANGELOG.md`
+
+Please try to fill in as much of the template below as you're able.
+
+* **What happened?**
+* **What were you trying to do?**
+* **What steps will reproduce the bug?**
+* **Does it reproduce every time? If not, why so?**
+* **Additional information:**
+If you receive an error or experience graphical bugs, include a screenshot.
+Also include a shareable build link, even in cases where you experience issues not specific to a certain build. This helps us greatly to reproduce bugs faster.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+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.
+
+**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.