Nano ESP32 file system option (#8566)

* io_pin_remap: additional bugfixes

- FunctionalInterrupt.h: prevent macro expansion in declaration
- io_pin_remap.h: fix remaining pin-remapped functions whose API
  allow a variable number of parameters

* Nano ESP32: make GPIO matrix reset robust to pin mode choice

* Nano ESP32: add backwards-compatible pin definitions

* Nano ESP32: erase flash when running "Burn Bootloader"

* Nano ESP32: add filesystem type selection

boards.txt

@@ -25663,6 +25663,15 @@ nano_nora.build.memory_type={build.boot}_{build.psram_type}
 nano_nora.build.disable_pin_remap=
 
 nano_nora.tools.esptool_py.program.pattern_args=--chip {build.mcu} --port "{serial.port}" --before default_reset --after hard_reset write_flash -z --flash_mode {build.flash_mode} --flash_freq {build.flash_freq} --flash_size {build.flash_size} {build.bootloader_addr} "{build.path}/{build.project_name}.bootloader.bin" 0x8000 "{build.path}/{build.project_name}.partitions.bin" 0xe000 "{runtime.platform.path}/tools/partitions/boot_app0.bin" 0xf70000 "{build.variant.path}/extra/nora_recovery/nora_recovery.ino.bin" 0x10000 "{build.path}/{build.project_name}.bin"
+nano_nora.tools.esptool_py.erase.pattern_args=--chip {build.mcu} --port "{serial.port}" --before default_reset --after hard_reset erase_flash
+
+nano_nora.menu.PartitionScheme.default=With FAT partition (default)
+nano_nora.menu.PartitionScheme.spiffs=With SPIFFS partition (advanced)
+nano_nora.menu.PartitionScheme.spiffs.build.partitions=app3M_spiffs9M_fact512k_16MB
+
+nano_nora.menu.PinNumbers.default=By Arduino pin (default)
+nano_nora.menu.PinNumbers.byGPIONumber=By GPIO number (legacy)
+nano_nora.menu.PinNumbers.byGPIONumber.build.disable_pin_remap=-DBOARD_USES_HW_GPIO_NUMBERS
 
 nano_nora.menu.PinNumbers.default=By Arduino pin (default)
 nano_nora.menu.PinNumbers.byGPIONumber=By GPIO number (legacy)

tools/partitions/app3M_spiffs9M_fact512k_16MB.csv

+# Name,   Type, SubType,  Offset,   Size,     Flags
+nvs,      data, nvs,        0x9000,   0x5000,
+otadata,  data, ota,        0xe000,   0x2000,
+app0,     app,  ota_0,     0x10000, 0x300000,
+app1,     app,  ota_1,    0x310000, 0x300000,
+spiffs,   data, spiffs,   0x610000, 0x960000,
+factory,  app,  factory,  0xF70000,  0x80000,
+coredump, data, coredump, 0xFF0000,  0x10000,