GHA:
- Drop builds for Ubuntu-16.04
- Added build for RTEMS-5 on pc686-qemu
- Disable tests on RTEMS-4.10
- Added builds for Windows debug and mingw
- Explicit names for each build
- Added timeouts for tests
- Upload .tapfile artifacts
Appveyor:
- Added timeouts for tests
- Update gcc build to use 2019 worker image