Add GitHub issue forms for bug reports and feature requests

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: File a bug report to help us improve
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: "# Please search the issue tracker for existing bug reports before submitting your own."
+  - type: input
+    id: system-information
+    attributes:
+      label: System Information
+      description: |
+        - The operating system you use to run LMMS.
+        - When relevant, also include your hardware information.
+      placeholder: ex. Fedora Linux 39, KDE Plasma 5.27.10 - 13th Gen Intel® Core™ i9-13950HX, 32GB RAM
+    validations:
+      required: true
+  - type: input
+    id: affected-version
+    attributes:
+      label: LMMS Version(s)
+      description: |
+        - The version of LMMS affected by the bug.
+        - Can be an official version number, nightly release identifier, or commit hash.
+        - The version number can be found under the Help > About menu.
+      placeholder: ex. 1.2.2, 1.3.0-alpha.1.518+gdd53bec31, 2d185df
+    validations:
+      required: true
+  - type: input
+    id: working-version
+    attributes:
+      label: Most Recent Working Version
+      description: |
+        - If there is a previous version of LMMS that did not exhibit the bug, please include it here.
+        - Using `git bisect` to determine exactly where the regression occurred will make it easier for LMMS developers to find and fix the bug.
+      placeholder: ex. 1.2.2, 1.3.0-alpha.1.518+gdd53bec31, 2d185df
+    validations:
+      required: false
+  - type: textarea
+    id: bug-summary
+    attributes:
+      label: Bug Summary
+      description: Briefly describe the bug and what LMMS did that was not expected.
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected Behaviour
+      description: Describe what should have happened and how LMMS should have behaved.
+    validations:
+      required: true
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps To Reproduce
+      description: |
+        - Describe the minimum steps one can follow to reproduce this bug for themself.
+        - If you included an MRP below, you can describe here how it should be used.
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: |
+        - Please copy and paste any relevant log output where instructed.
+        - LMMS log output can be obtained by running it via the console.
+      value: |
+        <details>
+        <summary>Click to expand</summary>
+        <pre>
+          <!-- paste logs here -->
+        </pre>
+        </details>
+    validations:
+      required: false
+  - type: textarea
+    id: supporting-files
+    attributes:
+      label: Screenshots / Minimum Reproducible Project (MRP)
+      description: |
+        - Please upload any screenshots showing the bug in action.
+        - If possible, also include a .mmp/.mmpz project containing the simplest possible setup needed to reproduce the bug.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for the project
+labels:
+  - "enhancement"
+body:
+  - type: markdown
+    attributes:
+      value: "# Please search the issue tracker for existing feature requests before submitting your own."
+  - type: textarea
+    id: enhancement-summary
+    attributes:
+      label: Enhancement Summary
+      description: |
+        - Briefly describe the enhancement.
+        - Explain how the proposed enhancement helps overcome a limitation of LMMS you are currently facing.
+    validations:
+      required: true
+  - type: textarea
+    id: justification
+    attributes:
+      label: Justification
+      description: |
+        - Describe why you believe this to be a good idea, and how you think it would improve LMMS.
+        - Is there a reason why this should be included in LMMS itself and not as a plugin?
+    validations:
+      required: true
+  - type: textarea
+    id: mockup
+    attributes:
+      label: Implementation Details / Mockup
+      description: |
+        - Explain how you believe this enhancement should be implemented.
+        - If your proposal encompasses changes to the user interface, please include **diagrams** displaying your intent.
+    validations:
+      required: true