0.5.3-rc.1

Unstable test release! Do not use unless instructed.

• Compiled with particle system framework 0.7.0-rc2
• Compiled with gcc 6 2017-q2 udpate
• Patches for gcc-6 compatibility from particle/fix/gcc_6.x
• Removed progmem references (an Arduino leftover)
• Changes to default settings for control

Code does not fit into Particle Core due to grown system framework size. Excluded until space optimizations can be found.