Remove QT from flow dependencies

[Bardo91]

Intro

There are two methods that still use QT in flow. These are related with the "extra" information for the creation of the blocks.

In this issue #20 , we have removed "nodes library", the purpose was to enable other developers to create new interafaces using other libraries or frameworks. This tasks will enable it completely by removing completely.

But the methods are being used now, and are very important as these allow to create richer interfaces specific to each block.

Posible solution

Create an intermediate language to explain what should be inside of that "widget" or "subwindow". For example

button { 
text: "click"
callback: "name of callback in method"
},
text_entry

Then, each graphical implementation is responsible of translating that into each specific framework