Provide 16- and 24-bit WAV export

[teetow]

Describe the bug
For maximum interoperability, 16- and 24-bit WAV formats should also be available for export

To Reproduce
Steps to reproduce the behavior:

1. Open the Export dialog
2. Choose WAV
3. Note the absence of a bit depth setting

Expected behavior
The ability to pick 16-bit, 24-bit or 32-bit depth

Platform information

• OS: Windows 10

Additional context
The 32-bit WAV format is recent enough that it doesn't have the ubiquitous compatibility enjoyed by the more established 16- and 24-bit WAV formats, nor is the disk space and processing overhead always warranted or desired. Notably, Logic Pro doesn't natively support 32-bit WAV.

Obviously, the files can be converted after the fact, but that's also true for mp3 and FLAC. I think it's reasonable to be able to pick the bit depth right at the time of export, to cut down on user inconvenience.