feat: new args to control location for logs and data

[asaintsever]

This pull request includes several updates and improvements to jExifToolGUI, focusing on upgrading dependencies, updating documentation, and refactoring code for better maintainability. The most important changes include upgrading Gradle, modifying the project structure, and updating URLs and version information.

Dependency Upgrades and Build Improvements:

• Upgraded Gradle to version 7.2 and updated the gradlew script to be POSIX-compliant. (gradle/wrapper/gradle-wrapper.properties, gradlew, gradlew.bat) [1] [2] [3]

Project Structure and Configuration:

• Moved the jexiftoolgui_data folder under the user's home .jexiftool folder. (src/main/java/org/hvdw/jexiftoolgui/MyConstants.java)

Documentation and URL Updates:

• Updated the project URLs to reflect the new repository location. (docs/index.html, src/main/java/org/hvdw/jexiftoolgui/ProgramTexts.java, src/main/java/org/hvdw/jexiftoolgui/Utils.java) [1] [2] [3]

Logging and Version Information:

• Disabled the file appender for logs, ensuring logs are available only on stdout. (Changelog.md)
• Updated version information to 2.1.0-als. (src/main/java/org/hvdw/jexiftoolgui/ProgramTexts.java)

Miscellaneous:

• Fixed the icon loading issue in the Utils class. (src/main/java/org/hvdw/jexiftoolgui/Utils.java)

These changes collectively improve the build process, update the project configuration, and ensure the project documentation is current.