Version 1.4 with updated Linux driver 1.5

Just like Version 1.4, but with an updated linux-side networktablet binary that will run on current Linux kernels.

Version 1.4

Improvements by @akdor1154, thanks!

• updated protocol version and documentation
• make networktablet act as a Tablet, not a Touchscreen
• Android clients sends stylus-in-range events if required

android-app-1.3: Version 1.3

* material design
* template image support
* power-saving dark canvas mode
* minor changes