Add new issue template system

.github/ISSUE_TEMPLATE/defect-report.md

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+---
+name: Defect report
+about: Report a software defect in TShock (a problem you know is our fault)
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Please provide the information requested below -->
+
+* TShock version:
+* TShock build number (if known):
+
+#### Reproduction steps (if applicable)?
+
+1. Some step
+2. Some other step
+3. Some bigger step
+4. This is the problem
+
+#### Any stack traces or error messages (if known)?
+
+```
+PUT SUPER LONG ERROR MESSAGES IN THE TICK MARKS
+```
+
+#### Any screenshots?
+
+#### Any log messages from files that end in `.log`?
+
+#### What plugins and what versions of those plugins are you running?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a change to be made to TShock
+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.