Added functionality for Eltako Dim Actuator

I made changes to theEnoceanBinding to be able to send some data to the Actuator and to support a acknowledgement process and variants of EEPs. The used Actuator is an Eltako FSUD-230V and uses a variant of the EEP A5-38-08. There are 3 different parameters that can be used in the item configuration:
TEACH_IN, DIM_VALUE_ACK and DIM_VALUE_NO_ACK. With TEACH_IN a user is able to send a teach-in telegramm, so that the Actuator knows the used USB300. With the DIM_VALUE parameters it is possible to send INCREASE/DECREASE and ON/OFF commands to the Actuator. DIM_VALUE_ACK uses a simple acknowledgement process to check if the acuator is
reachable. After 3 lost telegramms it send as STOP command to the item, which i used in the sitemap to change the label colour to red. The used EnOceanId for the items is the ID of the actuator. To use the EEP
variant the user has to write eep=A5:38:08:eltako.

I also made changes to the used EnOcean Library.