Upgrade library to BC 27 / runtime 16 and adopt new AL language features

[finnpedersenkazes]

Context

Version 27 of Business Central (runtime 16) introduces several new AL language features and capabilities that can simplify our standard library and improve compatibility with the latest platform.

Proposed changes

• Update app.json to target runtime 16.0 (Business Central 2025 release wave 2).
• Refactor existing functions to leverage new AL features such as:
  • continue keyword for loops to replace manual flow-control using extra variables.
  • Multiline strings for improved readability of long constant texts.
  • Overloaded ToText() methods and new IncStr parameter for incrementing string-based numbers.
  • Ability to read/write YAML using JsonObject and use lists/dictionaries of interfaces.
• Review functions like RemoveChar, KeepChar, and MakeDateFilter to see whether built‑in methods introduced in BC 26/27 can simplify or replace these implementations.
• Check for and adopt other relevant runtime 16 features (e.g. external file storage API, new report layout properties, etc.)

These improvements will align the library with the latest language capabilities and prepare it for long-term support.