Competitive Skill tree: maximizing build efficiency

... and I also want to see what happens when I publish an update, 'cause I could also ninja edit my own guides.

Edits:

• Added general rule of thumbs in Sensor skill tree (QP, FP and competitive game modes)
• Added game mode disclaimer (this guide is mostly meant for QP and FP)
• Edited "light's choice" mobility skill tree because there was 1 additional node that wasn't needed to achieve full speed tweak (torso pitch node on the right), so the skill set dropped from 26 to 25 nodes...