v2.0.0-alpha.166

Add num.parse and support 0x/0b prefixes for int.parse.
Support overriding the partition table.
Add support for pins on Linux.
Drop alloc tracing and avoid redefining malloc, realloc, free.
Expose external constructor for byte arrays.
Don't use '$HOME' to find the cache directory.
Propagate types through blocks when they are called or escape.
Add support for changing the hostname.
Force comparisons to be boolean.
Don't accept strings with '\0' for C operations.
Allow to set the BLE GAP name.
Use the eq-bytecode even without optimizations.
Switch from 'qemu' format to 'full-image' format.
Make 'Pin' an interface.
Remove partitions.csv from the envelopes.
Fix 'toit run' with snapshots.