Migrate all applets to V2 API

[whitequark]

This is necessary to retire the V1 API.

• audio-dac applet.audio.dac: migrate to V2 API #1084
• audio-yamaha-opx
• benchmark
• control-servo
• debug-arm7
• display-hd44780
• i2c-initiator
  • memory-24x
  • sensor-bmx280
  • sensor-ina260
  • sensor-scd30
  • sensor-sen5x (Modernize sensor-sen5x applet #946)
  • control-si535x
  • control-tps6598x
  • program-stusb4500-nvm
• i2c-target
• jtag-openocd
• jtag-pinout
• jtag-probe (applet.interface.jtag_probe: migrate to V2 API. #861)
  • sbw-probe
  • debug-arc
    • program-mec16xx
  • debug-arm
  • debug-mips
  • program-xc6s
  • program-xc9500
  • program-xc9500xl
  • program-xpla3
  • jtag-svf
• memory-floppy
• memory-onfi
• memory-prom
• ps2-host (applet.interface.ps2_host: migrate to V2 API. [WIP] #853)
  • sensor-mouse-ps2
• qspi-analyzer
• qspi-controller
  • memory-25x
    • program-ice40-flash
• selftest
• sensor-hx711 (applet.sensor.hx711: migrate to V2 API #1090)
• spi-analyzer
• spi-controller
  • program-ice40-sram (Modernize program-ice40-sram applet #922)
  • spi-flashrom (SPI flashrom: refactor and migrate to V2 API #919)
  • program-avr-spi (Modernize applet program-avr-spi #1110)
  • program-nrf24lx1 (Modernize applet program-nrf24lx1 #927)
  • radio-nrf24l01 (Modernize applet radio-nrf24l01 #935)
  • display-pdi (Remove display-pdi applet and the deprecated SPI controller #1113)
• swd-openocd
• uart
  • program-m16c
  • sensor-pmsx003
• video-hub75-output
• video-rgb-input
• video-vga-output
• video-ws2812-output