Add support for ATmega164pa

Adds the ATDF file provided from Microchip, and makes changes analog to
290613454fbdc5e4ac98e53deccaf74dafc88963.
This has been tested on real hardware.

Signed-off-by: Tronje Krabbe <tkrabbe@jusst.de>
Signed-off-by: Oskar Munz <omunz@jusst.de>

Prepare 0.3.4

Add support for attiny13a

Prepare 0.3.3

Add support for `asm!()`

Add support for ATmega1284p

Add ATmega128RFA1 support

Adds basic ATmega128RFA1 support. Adjusts the common USART patches for
UCSZ? slightly to work with the ATmega128RFA1's ATDF.

Add support for ATtiny1614

Prepare 0.3.2

Add support for ATtiny816

Add basic support for the ATtiny816 of the tinyAVR1-series.

README: Format device list as a table

Make it use less vertical screen space.

Even though the categories don't make 100% sense...

Add support for ATtiny2313/A

Mention tool versions in README

To prevent headaches and regressions, document the exact versions to be
used.

README: Update crates.io badge

Add ATtiny202 support

All of the svd patches are in patch/common/attiny-0-series.yaml which should
work for all of the 0-series (but may only work for ATtiny20* and ATtiny40*,
  but not 80* or 160* given how the datasheet is split)

Prepare 0.3.1

Add AT90USB1286 support

Ref: #80

Add ATmega8U2

Prepare 0.3.0

ci: Switch to GitHub Actions