Add search functionality for xmmp code in MyraPad

[orosbogdan]

When we have a lot of code in the xmmp, it is difficult to navigate without a search functionalty.

Ideally when pressing CTRL+F we should get a textbox that lets us search.

Alternatively, it would be nice if in the inspector from Myrapad (on the right side), as we click on the preview elements, the inspector would show the details about the most recently clicked one.

[captkirk88]

I think MyraPad would benefit well from a plugin approach that allows people to extend the functionality so that things like this would be easier to do. It would require a significant amount of work exporting functionality into a plugin architecture but the benefit being less issues of people having to fork the repo to make their specific small changes. I call it, "avoiding fork hell."