Zig 0.16.0

[mattnite]

Besides the mechanical upgrades, I've made the following choices:

• Create a simple and maintainable flags library that we will standardize on for CLI tools. This will reduce churn from dependencies such as zig-args and clap.
• Remove boxzer packaging. It was a cool experiment, but honestly we should be improving user experience by contributing upstream to zig itself.

[github-actions]

⚠️ Unused Imports Found

drivers/src/base/BlockMemory.zig:3:0: logger is unused
drivers/src/display/hd44780.zig:15:0: FunctionSet is unused
drivers/src/display/sh1106.zig:11:0: std is unused
drivers/src/io_expander/pca9685.zig:3:0: Digital_IO is unused
drivers/src/sensor/HTS221.zig:12:0: assert is unused
drivers/src/sensor/MPU_6050.zig:24:0: std is unused
drivers/src/wireless/cyw43/cyw43.zig:4:0: std is unused
drivers/src/wireless/cyw43/wifi.zig:22:0: IOCTL_SET_VAR is unused
drivers/src/wireless/cyw43439.zig:2:0: mem is unused
drivers/src/wireless/cyw43439/wifi.zig:5:0: assert is unused
port/nordic/nrf5x/src/hal/drivers.zig:5:0: std is unused
port/nordic/nrf5x/src/hal/drivers.zig:14:0: Stream_Device is unused
port/raspberrypi/rp2xxx/src/hal/cyw43.zig:1:0: std is unused
port/raspberrypi/rp2xxx/src/hal/cyw43_pio_spi.zig:3:0: std is unused
port/raspberrypi/rp2xxx/src/hal/cyw43_pio_spi.zig:9:0: chip is unused
port/raspberrypi/rp2xxx/src/hal/drivers.zig:14:0: Stream_Device is unused
port/stmicro/stm32/src/hals/STM32F103/drivers.zig:8:0: Stream_Device is unused
port/stmicro/stm32/src/hals/STM32F103/drivers.zig:1:0: std is unused
port/stmicro/stm32/src/hals/STM32F103/drivers.zig:9:0: Digital_IO is unused
port/stmicro/stm32/src/hals/STM32F103/uart.zig:12:0: drivers is unused
port/stmicro/stm32/src/hals/STM32F103/uart.zig:16:0: peripherals is unused
port/stmicro/stm32/src/hals/common/i2c_v2.zig:7:0: peripherals is unused
port/wch/ch32v/src/hals/drivers.zig:17:0: Stream_Device is unused
port/wch/ch32v/src/hals/drivers.zig:5:0: std is unused
port/wch/ch32v/src/hals/spi.zig:37:0: gpio is unused
port/wch/ch32v/src/hals/spi.zig:32:0: std is unused
tools/printer/src/main.zig:2:0: builtin is unused
tools/printer/tests/generate_test_data.zig:7:0: test_data_writer_buf is unused

Run zigimports --fix <file> locally to automatically remove unused imports.