Styles XF Rain 2.3

IMPORTANT INSTRUCTION ABOUT INSTALLING NEW VERSION:
1. It's only for Xenforo 2.3 and above
2. Uninstall old Rain theme
3. Create backup of your logo, theme background, forum icons, forum node backgrounds etc.
4. Uninstall old SFCore Extended plugin (if installed)
5. Uninstall old SFCore
6. Uninstall old Ultimate Content Display
7. Uninstall old Ultimate Custom Nodes (if installed)
8. Install StylesFactory Core theme
9. Install Rain
10. Install SFCore 2.0
11. Install Ultimate Custom Nodes (it's part of theme pack now, just add it here: https://stylesfactory.pl/products/ultimate-custom-nodes.33/)
12. Setup nodes and icons again.

Changes:
- Huge update of SFCore (many features were adjusted, some features like update info were removed)
- Forum nodes were rewritten and are much lighter than in previous version
- Node backgrounds are part of SFCore, node icons are part of Ultimate Custom Nodes plugin
- Ultimate Content Display got also some tweaks to work better
- Working with XF 2.3