Make it possible to change current logging handler

[piotrwach]

It should be possible to change logging handler used inside HockeySDK. For example application that I am working on uses its own logging system, and we want all logs to use it, including 3rd party libraries.

[msftclas]

All CLA requirements met.

[piotrwach]

I don't know why one of the checks is failing, as I don't have permissions to view bitrise.

[ElektrojungeAtWork]

Hi @piotrwach,
The HockeyLogger is not designed to be replaced by another logger. It's purpose is to allow for an API to adjust the amount of logs that the SDK emmits.
Maybe I'm missing something in your PR, but how does making our header file public solve your issue?

[piotrwach]

@TroubleMakerBen our app requires all logs to be stored encrypted on the device. By making BITHockeyLogger.h header public, we can change currentLogHandler to use our internal logging system.

[ElektrojungeAtWork]

Thx for the explanation @piotrwach.