To implement this feature in #17 I had to refactor some of the code. Mainly there's now a bit more parsing of the check.php endpoint happening.

Also the output logic now works with multiple "sub-checks" and outputs to determine the final exit code.

Example:

check_brevisone.py -H localhost:8000 --protocol http --failed-critical 18 --failed-warning 15   
[CRITICAL] - Brevis.One SMS Gateway Status
 \_[OK] Failed sending: 12
 \_[OK] Signal strength: 95
 \_[CRITICAL] Que length: 23
|que=23 failed=12 signal=95 total=885 time=1713865490 disk=1400246272 

A --debug flag was introduced to return the full check.php endpoint output.

Fixes #17