CodeSharper.Core/Commands/ToLowerCaseCommandFactory:
 - Add ToLowerCaseCommandFactory class to CodeSharper
CodeSharper.Core/Texts/TextRange:
 - Identify and fix bottleneck of performance
CodeSharper.DemoRunner/DemoApplications/CodeREPL/CodeReadEvaluatePrintLoopApplication:
 - Refactor demo app
Add new factories to library