Change label arg to impl Display

[jrmoulton]

I had picked Into<String> before because that seemed to me what made the most sense but using impl Display really makes more sense. One big benefit is that number types all impl Display but not Into<String> so with this numbers can just be used directly in labels which is what essentially what I had been going for with Into<String>. Should be a drop in replacement.

fn app_view() -> impl View {
    // create a counter reactive signal with initial value 0
    let (counter, set_counter) = create_signal(0);

    // create user interface with Floem view functions
    stack((
        label(move || counter.get()),           //  <----- can use an integer directly
        stack((
            text("Increment")
                .on_click(move |_| {
                    set_counter.update(|value| *value += 1);
                    true
                }),
            text("Decrement")
                .on_click(move |_| {
                    set_counter.update(|value| *value -= 1);
                    true
                }),
        )),
    ))
}

[codecov]

Codecov Report

Merging #106 (96393e8) into main (49ca91c) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff          @@
##            main    #106   +/-   ##
=====================================
  Coverage   3.74%   3.74%           
=====================================
  Files         51      51           
  Lines       8564    8564           
=====================================
  Hits         321     321           
  Misses      8243    8243           

Files Changed	Coverage Δ
src/views/label.rs	0.00% <0.00%> (ø)

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