Toggle verbosity

[patapizza]

Currently a lot of messages are printing out:

[mic] initialized sox: 14.4.1
[wit] init
[wit] initialized with device: default
...
[wit] read. state=idle
[wit] received response: {"_text":"..."}
...
[wit] trying to stop but no request started
[wit] ready. state=idle

Although this can be proved helpful while debugging, once it's up and running one would like to get it 'just working', i.e. silently.
So I'm thinking of three verbosity levels:

• All (current setting)
• Warnings (just errors/warnings, no [wit] init, [mic] initialized sox: 14.4.1, etc. messages)
• Silent (no output at all)

[martinraison]

I've been thinking the same - let's do it

[martinraison]

0bf1435 adds a verbosity argument to wit_init:

struct wit_context *wit_init(const char *device_opt, unsigned int verbosity);