Changes since v0.1:

• fixed the make install target not to depend on GNU install (Jakub Czekański)
• fixed failure to recognize upper case R to toggle RTS (Jakub Czekański).
• implemented a generic scan of /dev/nodes with macOS-optimized filtering (Jakub Czekański)
• FreeBSD-specific device detection with drivers and description
• generic exclusion list for impossible devices names (/dev/null, /dev/ptmx, /dev/mem etc)
• disabled waiting on -a/-n when -l (device list) is requested
• always use 115200 bps by default unless forced to 0 to keep existing speed
• support setting baud rate in environment using BT_PORT_BAUD_RATE
• support for ignoring certain drivers with BT_SCAN_EXCLUDE_DRIVERS
• support for trailing * in BT_SCAN_EXCLUDE_PORTS, BT_SCAN_INCLUDE_PORTS, BT_SCAN_RESTRICT_PORTS and BT_SCAN_EXCLUDE_DRIVERS