Add issue templates

handy to have

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Describe an issue with Denizen not working as expected.
+
+---
+
+<!-- Please fill in the asterisks sections below.
+Use https://one.denizenscript.com/haste to pastebin any scripts.
+ -->
+The output of `/version` on my server is: **paste here**
+The output of `/version denizen` on my server is: **paste here**
+(If relevant) A link to a paste of a script demonstrating the issue: **paste here**
+The issue is:
+**Describe your issue in full here**

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Suggest something new to add
+
+---
+
+<!-- Please ensure you're running the latest version of Denizen (new features are not backported).
+Please also ensure that what you're asking is not already present in Denizen.
+Describe your request below. -->

.github/ISSUE_TEMPLATE/i-m-having-trouble.md

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+---
+name: I'm Having Trouble
+about: Make an issue post that seems to be trouble on your end (not a bug in Denizen
+  itself)
+
+---
+
+<!-- Please fill in the asterisks sections below.
+Use https://one.denizenscript.com/haste to pastebin any scripts.
+ -->
+The output of `/version` on my server is: **paste here**
+The output of `/version denizen` on my server is: **paste here**
+(If relevant) A link to a paste of a script demonstrating the issue: **paste here**
+The issue is:
+**Describe your issue in full here**