TypeScript String Operations

The `typescript-string-operations` library (current stable v1.6.1) provides a collection of lightweight, utility functions for common string manipulations in TypeScript, inspired by C# string operations. It includes robust `formatString` with specifiers (e.g., `{0:L}` for lowercase, `{0:d}` for short date), `joinString` for concatenating arrays or objects with a delimiter, `isNullOrWhiteSpace` for comprehensive empty/null/whitespace checks, and an `emptyString` constant. A `StringBuilder` class is also available for efficient, mutable string construction, mirroring its C# counterpart. The library is designed to be lightweight, has no jQuery dependency, and is unit-tested, making it suitable for modern web applications, including those built with Angular. Its release cadence is feature-driven, with notable breaking changes in version 1.5.0, where uppercase-prefixed methods and the `String` class were deprecated in favor of named function imports to avoid polluting the global `String` object.