CS-Script 3.18.1

Release v3.18.1 * Release v3.18.1.0 (CSScriptLibrary.dll for NuGet; no changes in cscs.exe) * CLI improvements ** Added -dir:show to print all configured probing directories ** Reimplemented 'CLI help' support to be consistent with Linux convention. ** Added support for -help commands to print list of available commands ** Added support for -syntax to print documentation for CS-Script specific C# syntax. * Issue#19: Using wide wildcards in //css_inc can be improved * Added loosely coupled ScriptParser.AgregateReferences * Added printing a context specific error (with instructions on how to fix) on 'script not found' error * In verbose mode in the probing dirs list added top order current_dir item * Improved OnExit-cleanup algorithm ** CSScript.CleanupDynamicSources is scheduled for more reliable AppDomain.CurrentDomain.ProcessExit. ** Improved Cache management CSScript.CleanupDynamicSources made public.