UI Framework: Logging - hardcoded file name

[Moises Henriquez]

Using the UI framework for any application results in some logging being done, which is fine.

We have an annoyance where the logfile is hardcoded to 'installer.log'

See https://bitbucket.org/VLCore/vinstall/src/282c4fc2306cfae0983743fc8113368c39f6f2d1/vinstall/core/log.py?at=master&fileviewer=file-view-default#log.py-20

I suggest making this more flexible, or maybe move this around so we can use a decorated function

@core.logger
def myLoggingMethod():

or something like that. It would need to allow for output file name and logging level to be specified.