util.ignore_exception calls are silently failing

[PortableProgrammer]

For int environment variables (ex: TUYA_BRIGHTNESS), the existing code below doesn't work as intended, which then simply sets the environment variable to the default value.

# In env.py
self.tuyaBrightness = 128
...
brightness_try_parse = util.ignore_exception(ValueError, self.tuyaBrightness)(int)
self.tuyaBrightness = brightness_try_parse(os.environ.get('TUYA_BRIGHTNESS', self.tuyaBrightness))

We should switch to a less-complex method to parse the integer from a string, i.e.

# In util.py
def try_parse_int(value, base = 10, default = None):
 try:
 return int(value, base)
 except ValueError:
 return value

# In env.py
self.tuyaBrightness = util.try_parse_int(os.environ.get('TUYA_BRIGHTNESS'), default = self.tuyaBrightness)