Multiline string handling

[HenraL]

This pull request introduces version 1.0.19 of the asperheader extension, focusing on bug fixes related to header processing and description handling. The main improvements are in correctly handling description entries with carriage returns and making header detection more robust, particularly when the header's opening or closing lines are misplaced or missing. Additionally, the update is documented in changelogs and the README, and the version number is incremented.

Bug fixes and header processing improvements:

• Fixed processing of the description entry to properly handle carriage returns and prepend comments in front of description content. (vscode/asperheader/src/modules/commentGenerator.ts, README.md, CHANGELOG.md) [1] [2] [3]
• Improved header checking logic to handle cases where the closing line appears before the opening line, and added "grace lines" scanning to find the header closer if the opener is found but the closer is not within the initial scan range. (vscode/asperheader/src/modules/commentGenerator.ts, README.md, CHANGELOG.md) [1] [2] [3]
• Added localized messages for "grace lines" scanning in multiple languages. (vscode/asperheader/src/modules/messageReference.ts) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]

Versioning and documentation:

• Updated the extension version to 1.0.19 in package.json and package-lock.json. [1] [2]
• Added release notes for 1.0.19 in both root and extension CHANGELOG.md files and updated the README to reflect the new fixes. [1] [2] [3]

These changes enhance the reliability of header detection and description handling, and ensure users are informed about the improvements and fixes in the new version.