[Feature Request] User plugin in flash

[LuanTeles]

I would like to request a feature that the user can add some plugins in dev_flash/vsh/modules and it is loaded automatically by cobra, just like placing webman mod in flash that is supported. Something like custom_plugin.sprx or cobra can check a txt file in flash just like boot_plugins.txt

I think cobra could check the boot_plugins.txt in the following order

1. dev_usbxxx (for recovery of bad plugins) or we can hold r2 on boot to disable the load of plugins.
2. dev_flash
3. dev_hdd0

[LuanTeles]

Thinking well custom plugins in dev_flash2 would be better because they can survive fw updates, we can have plugins running even after formating the system or firmware update.