Replace Glyphicons with Bootstrap icons #2690
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Currently, Glyphicons shows unstable behavior in most cases of the whole project where sometimes icons are just no longer visible. To the best of my knowleadge, glyphicon is not for free any more except for a very limited package. Thus, here in this PR, i'm suggesting to use Bootstrap Icons where it is totally free and compatible with Bootstrap theme.
This PR fixes all disappeared icons that are written with glyphicon and they are replaced with Bootstrap ones. Moreover, Glyph icons is completely removed from the project.
/examples/bootstrap4showing variety of bootstrap usage.Note: In some parts of the code, glyphicon is already prefixed with Fontawesome icons css classes, so that the icon can be visible properly. I never change those cases since the icon is looking just fine. However I suggest to deprecate Glyphicon at all and keep Fontawesome and Bootstrap