Make it more clear which package this software depends on
Add prefix for min and max values
Increase max values
Allow changing tempo while playing
Support signal-slot connection management

Return a connection object when a slot is connected to a signal. Via
this object users can disconnect or block/unblock the signals.
Re-impelement macro for converting a time object to a string object

The former implementation produced unreadable overhead in log files
Add more logging for resuming playback
Fix execution of tests for VPATH builds
Enable file logging for tests
Fix failing tests

Tempo and pitch test fails due to changes for max values. ogg test still
seg faults at random situations and has been disabled.

Seek on continue check test fails due to strange open position and needs
further investigation.
Add more logging
Hide documentation for internal classes
Refactor check for required libraries