Fix/asciipietpp

[juner]

This pull request improves the ascii-piet++ parser and related documentation to support both | and @ as row separators, and updates analyzers and test code for consistency and clarity. The most important changes are summarized below.

Ascii-piet++ parser and documentation improvements:

• The ascii-piet++ parser (AsciiPietPlusPlusParser) now recognizes both | and @ as valid row separator markers, ignoring actual newline characters. This is reflected in the parser logic, documentation comments, and help text. [1] [2] [3] [4] [5]
• Added and updated tests to verify that both | and @ are accepted as row separators and that detection logic (LooksLikeAsciiPietPlusPlus) works with either marker. [1] [2]

Interpreter and CLI updates:

• The ascii-piet++ color table/help text now documents both | and @ as supported row-separator characters. [1] [2]
• Added an integration test to ensure the CLI correctly handles ascii-piet++ text input using the alternate @ row separator.

Code consistency and cleanup:

• Refactored code to consistently use the LanguageType alias instead of the fully qualified Esolang.Piet.Parser.LanguageType in MethodGenerator.cs for clarity and maintainability. [1] [2] [3] [4] [5] [6] [7] [8]

Analyzer and configuration updates:

• Updated .editorconfig to add or adjust analyzer rules (IDE0001, IDE0002, IDE0130), set accessibility modifier preferences, and remove MSTest-specific analyzer settings. [1] [2] [3]

Test code modernization:

• Cleaned up test code to use simplified type names and improved instance creation patterns in PietMethodGeneratorTests.cs. [1] [2] [3] [4]