feature req: add function chaining to all set...() functions -- return T&

[diablodale]

I request all set...() functions to support function chaining by returning a reference to themselves.
This is widely used across languages. Can be used both in C++ and in python bindings (python loves these).
Could combine with #355 as a task "make get() const and set() return T&"

myColorImgFrame.setCategory(2).setWidth(500).setHeight(200);
// or everything with rvalues
myfunc(myqueue->get<dai::ImgFrame>().setCategory(2).setWidth(500).setHeight(200));

Fixes are trivial

// old
void ImgFrame::setCategory(unsigned int category) {
    img.category = category;
}

// new
ImgFrame& ImgFrame::setCategory(unsigned int category) {
    img.category = category;
    return *this;
}

Setup

• all

Repro

Found while writing my app and having to make temp variables just to set...() some things.

[themarpe]

Thought about it as well, I think it will fit nicely.
Will address soon