Add support for js_escape/html_escape/strip_nl/trim parameters to the "m_include" tag

One of the powerful In-Portal features is an ability to create blocks of HTML that can be reused multiple times later. For example:

<inp2:m_DefineElement name="some_element">
... some html here ...
</inp2:m_DefineElement/>

Then these elements can be used via <inp2:m_RenderElement name="some_element"/> tag in any template.

Usually we have multiple blocks definitions in a dedicated templates and you need to include that template via <inp2:m_include template="path/to/block_definitions/template"/> tag to be able to use them.
To increase readability of these files (that only contains blocks) we add some empty lines between block declarations. As a result all these empty lines between block declarations are added into resulting HTML page.

To solve it we started adding strip_nl="2" parameter into m_include tag, like this <inp2:m_include template="path/to/block_definitions/template" strip_nl="2"/>, but it wasn't ever processed by that tag.
After a deeper investigation I've found that none of:

• js_escape
• html_escape
• strip_nl
• trim
  are being processed in that tag.