ISSUE_TEMPLATE: Use the newer issue templates

This utilizes the newer Github issue templates. They allow for the user
to specify what type of issue they are submitting to allow for a more
specific issue template to be shown.

In addition to a hopefully easier to read/parse/follow bug report
template, this also include templates for enhancements and i3
compatibility. This also includes a link to the IRC under the section
title Questions.

For the three templates, the labels bug, enhancement, and i3-compat will
be automatically applied for the appropriate report to assist in
triaging.

Hopefully, this will result in less questions and issues for new window
management functionality on Github and allow for better quality issues
being submitted. At the very least, it allows us to outline our
stances for bugs, enhancements, and i3-compatibility in an easier to
read format.

.github/ISSUE_TEMPLATE/i3_compat.md

@@ -0,0 +1,20 @@
+---
+name: i3 Compatibility
+about: Sway behaves differently from or lacks i3 functionality
+labels: 'i3-compat'
+
+---
+
+### Please read the following before submitting:
+- The following either do not make sense for Wayland or we have decided against supporting:
+  - `restart`
+  - `resource`
+  - saving and loading layouts
+  - the i3 sync protocol
+
+### Please fill out the following:
+- **i3 PR:**
+  - If this is new i3 functionality, please add a link to the i3 pull request.
+
+- **Description:**
+  - Please describe in plain English how Sway and i3's behaviors differ or what functionality Sway is lacking.