Code optimalization
VP-45, VP-46 implemented required and allow_empty metadata flags
VP-45 Removed white spaces, used string boolean values
Merge pull request #85 from jurasm2/feature/VP-45

VP-45, VP-46 implemented required and allow_empty metadata flags
Hotfix - config available content fileboard wrong key
Merge pull request #86 from dlu-gs/hotfix/config

Hotfix - config available content fileboard wrong key
Merge pull request #84 from miroslavhajek/develop

File editor code optimalization