Inject basedir - allow injecting IAppDomain

[304NotModified]

• having in two classes (LogManager & LogFactory) the (static) currentAppDomain is confusing
  • Moved logic to LogFactory,
  • removed internal stuff in LogManager
  • same logic will be executed
• cleanup of event-hook so we don't double hook
• don't use AppDomainWrapper everywhere, but the static IAppDomain property
• remove old #if stuff and handle empty properties of IAppDomain

Goal: inject basedir in another package, by using the IAppDomain

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This change is 

As the interface is altered for SL, this could a breaking change for SL. But i'm pretty sure there aren't custom implementations of IAppDomain for SL in custom code.

[codecov-io]

Current coverage is 81% (diff: 56%)

Merging #1906 into master will decrease coverage by <1%

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- Hits          15803      15795     -8   
+ Misses         3058       3056     -2   
- Partials        537        558    +21   

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[snakefoot]

@304NotModified Looks good to me. Like the removal of the if-defined.

Since LogManager is pretty much a static interface to the LogFactory, then it makes sense there is no "logic" in LogManager.