v1.0.4

Improvements on resiliency and performance.

• FFT display also synchronised to audio processing and packet sending.
• Audio and network errors are showing in tooltips. (on "capture" label and on PPS display)
• Detect if default audio device is changed and follow if necessary.
• IP address validity is checked at startup (only if set on the form)
• Network sending keeps running even if errors in the settings