Arduino core loopTask stack size is too small

The Arduino esp32 framework currently starts the task that's responsible for  running `void loop()` with a stack size of 8192 bytes. In the tests I've done, this is not enough for most libmapper applications, causing a stack overflow.

The stack size can be changed in `hardware/esp32/1.0.4/cores/esp32/main.cpp`.
16384 bytes works for me.
