v1.5.2

What's changed:

• New option for high-resolution waterfall (Issue #172)

• Much higher time resolution in waterfall (Issue #172)
• DSP processing optimizations and multithreading to reduce single-core churn
• Larger FFT size options (Issue #172)

• FT8 decode list settings are now persistent (Issue #162)
• Frequency Memory labels added to waterfall (Issue #166)
• Diversity controls added to main UI (Issue #165)
• CW fixes (Issue #170)
• Multi radio control and diagnostics fix (Issue #169)
• Zooming in on ICOM USB/CAT waterfall switches to audio waterfall at a certain zoom level for enhanced detail
• C segfault fix in Dream DRM decoder (Issue #171)