devel/arduino-tools: Update metaport to install 1.8.2 IDE/1.6.18 core and:

• Formerly missing OpenOCD
• ArduinoOTA for ESP8266 boards
• devel/arduino-avrdude to replace devel/avrdude
• switch to using devel/gcc-arm-embedded instead of arm-none-eabi-{gcc, newlib}

PR: 218235
Submitted by: Kyle Evans <bsdports@kyle-evans.net> (maintainer)