String: Separated string concatenation function to separate file.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Security: Using assert for error checking.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Modules: Path end at '\0' and path changed to const.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Network: Added support for getting values with NULL duda_request_t*.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
String: Added concatenation for N strings.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Logger: Created logger, currently creates rrd database.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>