Add char count and handle long messages

[OzymandiasTheGreat]

Added character count and this brought to my attention the fact that kdeconnect-cli quietly does nothing if message is longer than 160 chars. Splitting long messages into 160 char chunks now.

[b4j4]

Excellent, and now the only thing that is missing is the translation, i will update the pot file with references to Sms.py, let me know if you can make it translatable with the gettext api, by reference you can use this as example or i can do it !!

The only strings that need to be translated is: The line 41, 42, 137, 177, 192, 215, 230