Init uinput with the keys from the config file
Create complete input_event sequence to send within the gesture detection

- do not create the EV_SYN events inside the send_events method so also
  EV_REL events can be send with this method
Use global vars for gesture_start and mt_slots instead of passing them as pointers to different internal functions
Use also finger_count as global var
Added funtionality for scrolling

- added new configuration parameters for horz and vert delta
- send EV_REL events if corresponding delta values are exceeded
- added functionality to calculate the scroll velocity to implement a
  smooth scroll stop later