Balancing

- Nerf speed of level up of assistant (Threshold: 100 -> 125)

- Assistant will only gain experience when you / your squad have a base 

VFX

- No longer display sell button for base. And upgrade button for maxed structures.

- Added VFX when structures level up

Global Scoreboard

- Displaying Approximate Gold value instead of actual number (K, M, B, T, Qa)