Read additional BuildProperties from optional ./platform.sketch.txt file

[phd]

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Read additional BuildProperties from optional ./platform.sketch.txt file.

Allows sketches to provide and maintain their own platform.txt properties for use during the build process. Similar to platform.local.txt solution, but instead this is sketch based.

Provides a command line option -use-platform-sketch-txt to enable this feature in arduino-builder (disabled by default), for use with Arduino IDE. See: https://github.com/arduino/Arduino/pull/7821

See also: https://github.com/arduino/ArduinoCore-avr/pull/21 https://github.com/arduino/ArduinoCore-arc32/pull/588 https://github.com/arduino/ArduinoCore-sam/pull/52 https://github.com/arduino/ArduinoCore-samd/pull/335

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