fvarrui/JavaPackager v1.2.0 on GitHub

New features:
- Now JavaPackager is also available as a Gradle plugin 🥳
- Icons:
  - New properties added for each platform to specify icons instead of put them in assets folder (winConfig.icoFile, linuxConfig.pngFile, linuxConfig.xpmFile and macConfig.icnsFile)
  - ⚠️ iconFile property deprecated
- Tarball/zipball generation:
  - Execution permissions are now set to the proper files.
  - tar files are no longer generated, only tar.gz.
- Windows Setup language customization:
```
<winConfig>
    <setupLanguages>
        <english>compiler:Default.isl</english>
        <french>compiler:Languages\French.isl</french>
        <german>compiler:Languages\German.isl</german>
    </setupLanguages>
</winConfig>
```
Issues fixed:
- #41, Error at start on Windows (see winConfig.wrapJar property)
- #42, Add verification on project name
- #43, building for different OS with optimized JRE (see jdkPath property)
- #47, Package artifact as Windows Merge module (see winConfig.generateMsm)
- #48, Configure language installer (see winConfig.setupLanguages map property)