Refactor code structure for improved readability and maintainability, imporved matrix read, improved SB button read

dev/digital/Firmware_TEST/.gitignore

@@ -1,4 +1,7 @@
-.pio
+.pio/libdeps
+.pio/build/project*
+.pio/build/esp32-s3-devkitm-1/*
+!.pio/build/esp32-s3-devkitm-1/firmware.bin
 .vscode/.browse.c_cpp.db*
 .vscode/c_cpp_properties.json
 .vscode/launch.json