Release 0.30.0

This release significantly optimizes the speed and memory footprint of constants (literals and long calls) in the RP2040 (Raspberry Pi Pico) platform. It also changes task queues, used by semaphores, queue channels, and byte streams, so they favor readying higher-priority tasks. Note that deferred words have been removed, due to difficulties implementing them with the constant changes on the RP2040 platform.