Various additions

[PTKu]

This pull request introduces automatic generation of strongly-typed enum accessor properties for PLC enum-based and named value-based properties in the C# code generated by the AXSharp compiler. It also improves the handling and annotation of these enum properties, updates documentation, and makes minor fixes in pragma parsing and diagnostics.

Typed Enum Accessor Properties and Annotations

• The AXSharp compiler now automatically generates strongly-typed enum accessor properties (e.g., StatusEnum) for properties based on PLC ENUM types and named value types with integral backing types. These accessors allow direct, type-safe access to enum values without manual casting. [1] [2] [3] [4] [5]
• All such properties are annotated with [EnumeratorDiscriminatorAttribute] to maintain enum type information for serialization and UI support in both onliner and POCO classes. [1] [2]

Documentation Updates

• The documentation (ADDED_MEMBERS.md and README.md) has been updated to describe the new typed enum accessor property feature, including usage examples, scenarios, and important notes about reading values. [1] [2]

Pragma Parsing and Diagnostics

• Improved pragma parsing to handle malformed pragmas gracefully by swallowing exceptions and returning empty strings, preventing crashes during property value retrieval. [1] [2]
• Fixed diagnostic messages to display correct (1-based) line numbers for pragma errors.
• Adjusted pragma grammar rule ordering for correct parsing precedence.

Tests and Examples

• Updated generated test files to include the new enum accessor properties and annotations, ensuring the feature works as intended in various scenarios. [1] [2] [3] [4] [5]

Miscellaneous

• Added a helper method to detect if a named value type has an integral backing type, ensuring only eligible types get enum accessors.
• Minor code and comment formatting improvements. [1] [2] [3] [4] [5]

These changes collectively enhance developer ergonomics, type safety, and code clarity when working with PLC enums and named value types in AXSharp-generated C# code.

closes #510
closes #386
closes #455