Basic T2S+ V2 support

This release adds basic support for the T2S+ V2, which requires flat field correction on the host device. It's a bit rough, but if something isn't working properly, clicking the shutter button a few times will most likely fix it.

Some possible issues in this release:

• Android may complain about the app being old or insecure. This is due to the low API version, which allows it to run on older devices, and the lack of a Google-signed certificate. You can ignore this; the app will work fine.
• The app keeps showing "Disconnected" even after plugging in your camera. This likely means your camera has an unknown Vendor ID. If this happens, please open a new issue and attach the vendor and product IDs, which can be obtained by plugging the camera into a desktop and following this.
• The app warns about pointing the camera at hot objects. Press the shutter button to reset the message.
• The high-temperature range displays values that are too high. I haven't studied this range yet, but dividing the values by 10 should yield roughly correct results. This will be addressed in a future update.

Feel free to submit an issue if you find any other weird behaviors.