- ´!NEW_C4_STYLE=1´: component are remain drawn with orig, blue/gray background and node background remains white.
Other color are still swapped (works only with the 4 base themes).
- ´ROUNDED_STYLE=1´: rounded corners can be default
- 4 new themes `C4_blue_new`, `C4_brown_new`, `C4_green_new` and `C4_violet_new`
(own elements are with withe background like wireframe, only external elements have a gray background)
kirchsth