Text editor for effect composer

The why:

We have two instances of the effect creation pipepline. One with standalone-view and other which is integrted to Qt DS. These share some parts of the backend code but differ in usability. The latter is used with Qt DS and now has capabilities to fine-tune the shader code if needed. User can also create custom effects by implementing the shader code themselves.

Effect Maker (Qt FW) has had the functionality to copy+paste shader code done elsewhere and edit it to fit the needs.

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This is needed also on the Effect Composer (Qt DS) part. The user should be able to copy+paste single shader file (having both vertex and fragment shader in) from e.g. shadertoy, edit the file to be compliant with Qt and then save it as custom shader with a name.

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The resulting effect should be usable the same way as the built-in effects are.

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(for DS5: the effect should be visible in the Assets view)