v0.2.0

Added

• Frame acks with ESP-KVM 0.65.0 or newer: the device sends only as many
  frames as the link carries, so a slow link shows the newest frame. Older
  firmware works too, more slowly over a slow link.

Fixed

• Wi-Fi could stop for good soon after the picture started.
• Video over Wi-Fi stalled for 1-3 s every few seconds: the Wi-Fi driver ran
  out of its small internal memory and dropped packets. Its buffers are in
  PSRAM now.
• Video over Tailscale crawled. It runs at about 11-14 fps at 720p now.
• After the device restarted, the Tab5 could not reach it over Tailscale
  again.
• Every round trip took 300-600 ms while the screen was on (Wi-Fi power
  save). It is off while the screen is on.
• Mouse and ping sends no longer wait for a long frame read.
• Internal RAM ran down to about 1 KB free when the picture started.