DTMF Decoder 1.12
- removed CR + LF characters from the character strings sent on UART

DTMF Decoder 1.11
- corrected a time measuring related bug

DTMF Decoder 1.1
- added time measuring - the time when a character was decoded is sent on UART

DTMF Decoder 1.0
- DTMF detection with Goertzel algorithm
- the decoded character is displayed on 7-segment cell
- the decoded character is sent on UART
- low power mode
