cleanup boot.py, move imports to where they are used to help with faster startup times in debug mode ; general code cleanup ; this should be the 'final form' for now

boot.py

@@ -1,17 +1,17 @@
 print('START boot.py')
 
-# Used http://kmkfw.io/docs/boot/ as starting point
+# Used http://kmkfw.ioy/docs/boot/ as starting point
 
-import supervisor
-import board
-import digitalio
 import os
-import storage
-import usb_cdc
-import usb_hid
 
-from kmk.quickpin.pro_micro.kb2040 import pinout as pins
+# Enable use w/ BIOS
+if os.getenv('ARDUX_KMK_DEBUGGING'):
+    print('START bios hid enable')
+import usb_hid
 from usb_hid import Device
+usb_hid.enable((Device.KEYBOARD, Device.MOUSE), boot_device=1)
+if os.getenv('ARDUX_KMK_DEBUGGING'):
+    print('END bios hid enable')
 
 # Print env vars if debugging enabled
 if os.getenv('ARDUX_KMK_DEBUGGING'):
@@ -29,6 +29,8 @@ else:
 
 # If this key is held during boot, don't run the code which hides the storage and disables serial
 # bottom row, index finger key / bottom row pinky key
+import digitalio
+from kmk.quickpin.pro_micro.kb2040 import pinout as pins
 key_1 = digitalio.DigitalInOut(pins[12])
 key_2 = digitalio.DigitalInOut(pins[15])
 
@@ -43,15 +45,13 @@ key_2_val = not (key_2.value)
 # Check for key hold and disable any dangerous features
 if not (key_1_val or key_2_val) and not os.getenv('ARDUX_KMK_DEBUGGING'):
     if not os.getenv('ARDUX_KMK_USB_DISK_ALWAYS'):
+        import storage
         storage.disable_usb_drive()
+    import usb_cdc
     usb_cdc.disable() # Equivalent to usb_cdc.enable(console=False, data=False)
 
 # Deinit pins so they can be setup per the kmk keymap post-boot
 key_1.deinit()
 key_2.deinit()
 
-# Enable use w/ BIOS
-
-usb_hid.enable(boot_device=1)
-
 print('END boot.py')