This PR contains the work done to provide string localisation support for the `Core` library.
To provide further details about the work done:
- [x] implemented the `localisation(for:)` function for the `Bundle+LocalisationBundle` extension;
- [x] implemented the `localise(for: in: value: table:)` function for the `String+Localisation` extension;
- [x] defined English as the default localisation language in the `Package.swift` file;
- [x] added the "vscode" target to the `Makefile` file.
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Reviewed-on: #21
Javier Cicchelli
060d8a84a9