`renderd` coverage is otherwise not properly reported
_Also:_
- Removed `freebsd12` from CI
- Packages are no longer provided (http://pkg.freebsd.org/)
- Added test for `HTCP host name` specification
- Renamed files in `src`/`includes` to match target names
- `src/daemon.c` → `src/renderd.c`
- `src/speedtest.cpp` →`src/render_speedtest.cpp`
- `includes/daemon.h` → `includes/renderd.h`
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