Update issue templates

The old template that combined both bug reports and issue requests has led to various weird issues being filed, maybe having a separate one for each will help.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,29 @@
+---
+name: Bug report
+about: Create an issue that documents a bug
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Reproduction steps**
+Steps to reproduce the bug.
+<!-- Usually this means a small and self-contained piece of code that uses Catch and specifying compiler flags if relevant. -->
+
+
+**Platform information:**
+<!-- Fill in any extra information that might be important for your issue. -->
+ - OS: **Windows NT**
+ - Compiler+version: **GCC v2.9.5**
+ - Catch version: **v1.2.3**
+
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: Feature request
+about: Create an issue that requests a feature or other improvement
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Description**
+Describe the feature/change you request and why do you want it.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.