Clang format

[2bndy5]

• Apply new clang-format config to all C++ sources (new Arduino config replaces old Astye config).
• Update CI workflows to check formatting and report code size changes (upon opening PRs - only for ATSAMD21 ATMEGA328 chips).

[github-actions]

Memory usage change @ 680f7f1

Board	flash	%	RAM for global variables	%
arduino:avr:nano	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrzero	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/helloworld_rx flash	%	examples/helloworld_rx RAM for global variables	%	examples/helloworld_rx_advanced flash	%	examples/helloworld_rx_advanced RAM for global variables	%	examples/helloworld_tx_advanced flash	%	examples/helloworld_tx_advanced RAM for global variables	%	examples/helloworld_tx flash	%	examples/helloworld_tx RAM for global variables	%	examples/Network_Priority_RX flash	%	examples/Network_Priority_RX RAM for global variables	%	examples/Network_Priority_TX flash	%	examples/Network_Priority_TX RAM for global variables	%
arduino:avr:nano	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0
arduino:samd:mkrzero	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,examples/helloworld_rx<br>flash,%,examples/helloworld_rx<br>RAM for global variables,%,examples/helloworld_rx_advanced<br>flash,%,examples/helloworld_rx_advanced<br>RAM for global variables,%,examples/helloworld_tx_advanced<br>flash,%,examples/helloworld_tx_advanced<br>RAM for global variables,%,examples/helloworld_tx<br>flash,%,examples/helloworld_tx<br>RAM for global variables,%,examples/Network_Priority_RX<br>flash,%,examples/Network_Priority_RX<br>RAM for global variables,%,examples/Network_Priority_TX<br>flash,%,examples/Network_Priority_TX<br>RAM for global variables,%
arduino:avr:nano,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrzero,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0