Added buttons for Start/Stop Microphone/Speakers recording

[frsvme]

Good afternoon, my friend and I really liked your project and we decided to improve it a little: added buttons to control recording from the microphone and headphones channels, as well as slightly changed the behavior of the initialization logic of files added to the program in the web panel. Thank you for your efforts!

[sonodima]

Great work, thank you! I'll take a deeper look later this week and merge your changes if everything looks good 👍