Release 1.1.6

[yutaro-sakamoto]

This pull request includes several updates and improvements across multiple files, focusing on version updates, UTF-8 support, and build configuration enhancements. The most important changes are summarized below:

Version Updates:

• Updated version references from 1.1.5 to 1.1.6 in multiple files, including configure, README.md, README_JP.md, libcobj/app/build.gradle.kts, and libcobj/app/src/main/java/jp/osscons/opensourcecobol/libcobj/Const.java. [1] [2] [3] [4] [5]

UTF-8 Support:

• Added support for compiling UTF-8 encoded COBOL and generating UTF-8 encoded Java. This change is documented in the CHANGELOG.md, NEWS, and ReleaseNote.md files. [1] [2] [3]

Build Configuration:

• Enhanced the build process in .github/workflows/build.yml by adding conditional steps for configuring and building the project based on input arguments.
• Added a step to run ./gradlew javadoc in the javadoc.yml workflow to generate Java documentation.

Codebase Updates:

• Modified cobj/pplex.l to handle UTF-8 character sets and updated the convert_ucs_hyphen_minus function for better handling of hyphen-minus characters. [1] [2]

Documentation:

• Updated the README.md and README_JP.md files to reflect the new version and corresponding download links. [1] [2]
• Add a description of installations of a compiler for UTF-8 encoded COBOL source code.