[examples] Deduplicate USB FATFS example

Author: salkinium

examples/black_pill_f411/usbfatfs/ffconf_local.h renamed to examples/ext/usbfatfs/ffconf_local.h

@@ -93,7 +93,7 @@ check_for_update()
 			{
 				if (is_valid(&fil, fno.fsize))
 				{
-					Board::Led::set();
+					Board::Leds::write(1);
 					// We first copy the file into the last Flash section of 128kB.
 					// It's not guaranteed that the file is stored in FatFs in *one*
 					// continous chunk and we cannot access FatFs code in ram_apply!!!

examples/black_pill_f411/usbfatfs/main.cpp renamed to examples/ext/usbfatfs/main.cpp

@@ -1,5 +1,6 @@
 <library>
   <extends>modm:black-pill-f411</extends>
+  <!-- <extends>modm:nucleo-f429zi</extends> -->
   <options>
     <option name="modm:tinyusb:config">device.msc, device.cdc</option>
   </options>
@@ -10,5 +11,11 @@
     <module>modm:platform:flash</module>
     <module>modm:build:scons</module>
     <module>modm:math:utils</module>
+    <!-- Required when using CFG_TUSB_DEBUG on e.g. modm:nucleo-f429zi -->
+    <!-- <module>modm:printf</module> -->
   </modules>
+  <collectors>
+    <!-- For debug output via STLink on e.g. modm:nucleo-f429zi -->
+    <!-- <collect name="modm:build:cppdefines">CFG_TUSB_DEBUG=2</collect> -->
+  </collectors>
 </library>