CH340G Usb-to-Serial support (Arduino-based clones)

[DRSDavidSoft]

Hey @xxxajk, since there seems to be more active development in this fork, I'd like to merge @ideniden's modifications to Physicaloid which makes it support CH340G USB-to-Serial chips. These chips are used in a lot of Arduino-based clones.

That way, when your pull-request merges into the main branch (hopefully soon), we'd already have CH340G support.

Of course, @ideniden's code seems to need a bit of refactoring, so if you've got some time on hand, merging and cleaning those are much appreciated.

Thanks for your time!

[DRSDavidSoft]

My apologies, but there seems to be a problem with @ideniden's implementation:

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.usb.UsbDeviceConnection.controlTransfer(int, int, int, int, byte[], int, int)' on a null object reference
    at com.physicaloid.lib.usb.driver.uart.UartCH340.setBaudrate(UartCH340.java:151)
    at com.physicaloid.lib.usb.driver.uart.UartCH340.setUartConfig(UartCH340.java:106)
    at com.physicaloid.lib.framework.Uploader.upload(Uploader.java:47)
    at com.physicaloid.lib.Physicaloid$1.run(Physicaloid.java:417)

I'm sorry for opening this pull request, it needs to be delayed until this problem is sorted out.

[xxxajk]

That would be extremely cool. Can you resolve the conflicts?

[xxxajk]

Also, please note that I do not use any of the gradle stuff, so I don't maintain any of it.
I use Apache ant for building on classic android setup.
So if there is anything that needs to be changed/added there to add in the new stuff I put in, I'm ignorant if it has any adverse effects.

[xxxajk]

Broken, besides I have written my own.