Remove deprecated logs

[abelgardep]

During #2730, some logs functions were deprecated in order to avoid a big refactor and posible conflicts with new architecture modularization. Now, modularization has been merged so these deprecated functions can be removed and replaced with new ones.

PR

• App Replace Log_OC with timber #2770
• Library (if needed) Replace Log_OC with timber android-library#293

[hannesa2]

Please switch direct to Timber and delete Log_OC complete, then I can get rid of the need of JakeWharton/timber#371 and can use common upstream version instead of special version which support delegation

[hannesa2]

It's not a hard requirement for this timber-only task, but I start to remove it AppDevNext/Logcat#31

[abelgardep]

To move this forward as soon as possible, it would be great to know how to approach this.
3 options:

• Keep using Log_OC but updated methods.
• Switch direct to Timber not removing Log_OC
• Switch direct to Timber removing Log_OC.

@davigonz @jesmrec @michaelstingl

[davigonz]

Log_OC is meant to log the ownCloud App for Android and oC Android library and I think that we should not maintain it just because it could be used by other apps using the library, our library is not a logging library but "an easy way to communicate Android apps with ownCloud servers".

Logging is an additional task that any app using the oC Android library should take care of in my opinion.

Said this, I would implement the last option Switch direct to Timber removing Log_OC