Restore global api functions

[kpgalligan]

The api refactor cut the global functions that were added for tag convenience.

Reference: #371

[sproctor]

Restoring the global functions seems to have made them ambiguous.

Logger.d(tag = "MyTag") { "debug message" }

Now gives:

e: file:... Overload resolution ambiguity: 
public final fun d(tag: String, throwable: Throwable? = ..., message: () -> String): Unit defined in co.touchlab.kermit.Logger.Companion
public final inline fun d(throwable: Throwable? = ..., tag: String = ..., message: () -> String): Unit defined in co.touchlab.kermit.Logger.Companion

[SamC-Apadmi]

Is there a solution to this ambiguity problem? 👀