Optmize further performance due to get rid of react-size

Feature

• Optimize further performance due to geting rid of react-size
• completely get rid of the package
• Performance should be little better now, because the component hasnt to be rendered now for every element

Download and Install

• mac: Please, download the *.dmg File (can be seen on "assets" at the bottom here) and double click
• win: Please, download the *.exe File (can be seen on "assets" at the bottom here) and double click
• linux: Please, download the *.tar.gz File (can be seen on "assets" at the bottom here) and you know, what to do