> Refactoring `Indenter`, extracted `SimpleIndenter` as a base class; formerly private helper methods involving `LogicalCodeLine` had to be made `protected`, so `LogicalCodeLine` and `AbsoluteCodeLine` had to become `public` types.

As a result, external code can reference `Rubberduck.SmartIndenter.dll` and use a `SimpleIndenter`/`ISimpleIndenter` without bringing `Rubberduck.VBEditor.dll` into the picture, which closes #5911.

> **Rubberduck version information**
The info below can be copy-paste-completed from the first lines of Rubberduck's log or the About box:

Version 2.5.2.6030
OS: Microsoft Windows NT 6.2.9200.0, x64
Host Product: Autodesk® Inventor® 2018 x64
Host Version: Autodesk Inventor 2018
Host Executable: INVENTOR.EXE


**Description**
The software works correctly when first loaded and refreshed, with 1-2 documents open. If you open 2-3 documents, you get an Unexpected Exception. The