Improvements to the Version Deployment system

Our Version Deployment feature is a powerful tool for developers. Recently, it came to our attention that the readme.txt processor was unintentionally adding extra line spaces while stripping codes in between [//]: # fs_{free|premium}_only_{begin|end} tags.

We’ve fixed the issue and added improvements to handle both block and inline tags. As seen above, texts are properly stripped off and consistently maintain the space and new lines.