Audacity 3.4.2

This is a hotfix release. It fixes the following issues:

• Fix a crash when opening projects with zero-length clips. #5568
• When exporting a file, the sample rate of the tracks is now considered, and last-used sample rate is remembered. #5032
• Copy-pasting now pastes into audio again by default. This can be changed via Preferences -> Track Behavior -> Always paste audio as new clips. #5555
• Mix and render now also resets the gain for the resulting track. #5549
• Fix clips shifting to the right when effects are applied to them. #5571
• Fix clicks occurring when overdubbing a project with muted tracks. #5106
• Fix files being exported without a file extension in rare cases. #5533
• Show all sample rates possible for MP2 exports. #5539
• Fix pasting into labels. #5518
• Fix a crash when clearing loops. #5543
• Fix copying when "select all audio if selection required" is enabled. #5529
• Fix GTK detection and compilation for wxWidgets 3.2.4. #5598 #5552
• Fix Nyquist-related crashes. #5551
• Fix EQs in macros. #5604
• Fix a crash when closing Audacity. #5511
• Fix builds on armhf. #5476