* feat(parser): write test for only allowed tags parsing
* chore(parser): rename only allowed test
* fix(parser): only allowed tag rendering
* fix(plugin-helper): add new TagNode toString tests
* feat(parse): allow tags to be escaped with backslash
adds additional option `enableEscapeTags` to `parse` and `createLexer` that
when true will parse openTag and closeTag as WORD (rather than TAG) when
proceeded with backslash
— all operations on nodes moved to `createList` function
- fixed problem with single tags with value only like `[url=value]` fixes#6
- write tests for `Token` class
- moved all node arrays to parse func, now parser supports many instances
- add jsdoc to critical parts of the parser to better understanding how it works
Nikolay Kostyurin