Update issue templates

Author: sustained

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug
+about: Report an issue or error.
+title: ''
+labels: 'type: Bug'
+assignees: ''
+
+---
+
+# Description
+
+<!-- A clear and concise description of the issue. -->
+
+# Reproduction
+
+<!-- What exactly do we need to do to trigger the issue? -->
+
+# Expected Behaviour
+
+<!-- How do you think it should behave instead? -->
+
+# Additional Information
+
+<!-- Any other information that you may be relevant, e.g. platform (mobile/desktop), OS etc. -->

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement
+about: Suggest a change or improvement to an existing feature.
+title: ''
+labels: 'type: Enhancement'
+assignees: ''
+
+---
+
+# Overview
+
+<!-- Briefly describe the feature that you would like improved / to improve. -->
+
+# Rationale
+
+<!-- What's the thinking behind it / what makes it better than it already is? -->
+
+# Potential Issues
+
+<!-- Are there potential issues relating to implementation, or interaction with existing features? -->
+
+# Additional Information
+
+<!-- Any other information that you feel may be relevant. -->

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature
+about: Suggest the addition of a new feature.
+title: ''
+labels: 'type: Feature'
+assignees: ''
+
+---
+
+# Overview
+
+<!-- Briefly describe the feature that you would like added / to add. -->
+
+# Rationale
+
+<!-- What's the thinking behind it / why do you think it's a good idea? -->
+
+# Potential Issues
+
+<!-- Are there potential issues relating to implementation, or interaction with existing features? -->
+
+# Additional Information
+
+<!-- Any other information that you feel may be relevant. -->