wip/tslib 1.16 NetBSD

tslib is a cross-platform library that provides access to touchscreen devices and the ability to apply filters to their input events.

tslib is used to access touch screen devices, in case the operating system doesn't provide driver support. It may instead also only be used to optimize the touch user experience by applying mathematical filters in any number or order. The libts library is highly configurable and portable. tslib includes tools to calibrate, test and use the library. It is well suited for embedded devices and used in many commercial products. tslib includes documentation on how to use it.