fix: Stopping propagation of handleKeyDown event (signavio#453)

Co-authored-by: Labstep Onoufrios <onoufriosm@gmail.com>

chore: appease linter

fix: wrong conversion of markup to regex (signavio#430)

closes signavio#429

fix: signavio#410 make sure the default position is absolute for pure…

… inline styles (signavio#415)

Next major: Upgrade substyle & make cut/copy & paste generally availa…

…ble (signavio#393)

* chore: upgrade substyle, prettify, fixed some problematic props passing

* BREAKING CHANGE: if you use react-mentions together with local versions of substyle, substyle-jss or substyle-glamor, you need to upgrade to these packages to their latest versions (substyle@9, substyle-jss@4, substyle-glamor@4)
* BREAKING CHANGE: inline style passed to the textarea/input element are no longer forwarded to the highlighter element

* feat: generally enable cut/copy & paste

BREAKING CHANGE: cut/copy & paste is now enabled by default, the prop `EXPERIMENTAL_cutCopyPaste` is no longer supported and must be removed from `<MentionsInput >`

* chore: fix example after the breaking change about forwarding input props

* fix: use more sensible default styles

bring some order into the example styles

* upgrade to substyle 9 and adjust API

* chore: fix emoji example styles

* chore: upgrade to fixed version of substyle

fix: browsers not firing compositionEnd event (signavio#402)

It is discovered that compositionEnd event will not fire if all of the following conditions are matched

1. Use Chrome / Firefox
2. Use Sucheng input method
3. select suggestion by enter which the display item ends with a character which only requires one char to input for the method, for example, '手'，'田'，'水'，'口'，'人'

This issue leads to suggestion item like '所有人' ends up to become '@[所有人](all)人', which expected result should be '@[所有人](all)'

fix: remove carriage returns from pasted strings (signavio#367)

feat: Add the possibility to mention users with accents without havin…

…g to search with the accents (signavio#359)

* Create service to get the subtring index with or without ignoring the accents

* Add ignoreAccents prop to the Mention input

* Use ignoreAccents props to have the possibility to get the substring index ignoring the accents

* Add an example ignoring the accents

feat: Add optional bottom guard for rendering suggestion list (signav…

…io#339)

* adds guard for mentions suggestions list clipped by bottom of window

* add guard for suggestionlist without portals

* Add prop so that the rendering above is opt in

* Add example for bottom guard

fix: Support experimental copy & paste in IE 11 (signavio#349)

* signavio#349 Ignore cut, copy and paste events that do not support clipboardData

* signavio#349 Added hint about missing support for IE to example