[Downloader] Improved build and local directory detection
Merge remote-tracking branch 'GitHub-Vilarion/feature/gradle' into feature/gradle
[Downloader] Disable packaging on build

the packaging is in general cool, however it only generates the
bundle required for the local operating system and not for all
OS
[Downloader] Fixed CSS so files are load properly from the classpath
[Download] Changed loading of resources
[Build] Added security data to generated manifests
[Downloader] Fix spelling in installation dialogs
[Downloader] Add text field style
[Downloader] Add radio button style
[Downloader] Adjust installation window layout