MAGN-564 Aqua is a terrible thing to do to a UI

This fix will change the Aqua (cyan) color  to #4192D9 (a more darker version of cyan and blue color). 

Below are the places where this is changed 
1. Node connections
2. Node selection
3. Point and Line selection. 

So, when a node is selected, the corresponding Point / Line in the geometry and the connectors to / from that node will be changed from Aqua color. 

- [ ] @pboyer 
- [ ] @lukechurch