Add fontawesome plugin for TinyMCE 5

[manu37]

editors/tinymce5: directory added and /fontawesome/plugin.min.js plugineditor.windowManager.open() calls modified

[cmb69]

Thanks! Did you use fontawesome/plugin.min.js which is shipped with Fa_XH 1.2/CMSimple_XH 1.7.2 as base? Next time better use fontawesome/plugin.min.js from the sources.

Anyhow, there are issues with FA icons inserted in headings (and maybe other places as well) – I cannot delete these anymore. :?

PS: Regarding deleting icons: there are general issues in Chrome (IE 11 and FF work); backspace doesn't delete the icon, but rather acts like left arrow key; delete key works, but not if the icon is at the start or the end of a block level element.

[cmb69]

The problems with deleting the icons in Chrome (can still reproduce this with latest version) are not particularly related to Font Awesome or the plugin, but rather a general issue with empty spans; sad, but it is like it is. So I'm going to merge the PR with the tweaks mentioned above.