add AbstractVerbositySpecifier

Author: jClugstor

src/SciMLBase.jl

@@ -629,14 +629,21 @@ abstract type ADOriginator end
 """
 $(TYPEDEF)
 
-Used to specify which variables can be aliased in a solve. 
+Base for types that specify which variables can be aliased in a solve. 
 Every concrete AbstractAliasSpecifier should have at least the fields `alias_p` and `alias_f`. 
 """
 abstract type AbstractAliasSpecifier end
 
 """
 $(TYPEDEF)
 
+Base for types which specify what will be printed during a solve. 
+"""
+abstract type AbstractVerbositySpecifier end
+
+"""
+$(TYPEDEF)
+
 Internal. Used for signifying the AD context comes from a ChainRules.jl definition.
 """
 struct ChainRulesOriginator <: ADOriginator end