Skip all spaces around and inside tags

[infernalmaster]

Changes:

• all spaces are removed just like ReactJs does, so output code is almost minified
• small refactoring for children nodes rendering
• code inside javascript: and css: section is also minified so it pushes issues with JavaScript template literals even further. Before this change only empty lines inside template literals were remove, but now almost all spaces are removed inside them

I propose to add spaces using similar to ReactJS way: = " "
We can also use ' to add space after text

This change allow to fix that
#29
#42

[jeromegn]

I think this is on the right track, but how do we handle tags that should not be minified like <pre> where whitespace is important? We should add tests for that too.

[infernalmaster]

You are right, so looks like we need to preserve original formatting for <pre> and <script>. Even right now master branch has problems with that because it's reformat everything to use double space and also skips all empty lines