github: update issue templates

Add new templates matching the new GitHub options, Bug report and Feature request

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: If you are sure you have found a bug, then choose this to open a bug report
+
+---
+
+**IF YOU DON'T REMOVE THESE FOUR LINES, THEN YOUR REPORT WILL BE CLOSED AUTOMATICALLY**
+Questions and user problems should be directed at the forum (http://discuss.ardupilot.org)
+_**Please be very sure you have found a bug when opening this issue**_
+If there was a previous discussion in the forum, link to it
+
+### Bug report
+
+**Issue details**
+
+_Please describe the problem_
+
+**Version**
+_What version was the issue encountered with_
+
+**Platform**
+[  ] All
+[  ] AntennaTracker
+[  ] Copter
+[  ] Plane
+[  ] Rover
+[  ] Submarine
+
+**Airframe type**
+_What type of airframe (flying wing, glider, hex, Y6, octa etc)_
+
+**Hardware type**
+_What autopilot hardware was used? (Pixhawk, Cube, Pixracer, Navio2, etc)_
+
+**Logs**
+_Please provide a link to any relevant logs that show the issue_

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: If you have an idea for a new feature, choose this option
+
+---
+
+**IF YOU DON'T REMOVE THESE FOUR LINES, THEN YOUR REQUEST WILL BE CLOSED AUTOMATICALLY**
+Questions and user problems should be directed at the forum (http://discuss.ardupilot.org)
+_**Please do a careful search before opening this, there are already a lot of feature requests**_
+If there was a previous discussion in the forum, link to it
+
+### Feature request
+
+**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._
+
+**Platform**
+[  ] All
+[  ] AntennaTracker
+[  ] Copter
+[  ] Plane
+[  ] Rover
+[  ] Submarine
+
+**Additional context**
+_Add any other context or screenshots about the feature request here._