[Game Play] Too much 'grow' and 'shrink'

[EvoLandEco]

Players become very large when it collides with other players. The same is true for the opposite, as the other player shrinks greatly.
We can adjust the effects of 'grow' and 'shrink', to a reasonable level

[EvoLandEco]

Seems that it is not the problem of the m_growth_factor, it could be similar to the projectiles, previously the projectiles have no built-in cool down, the players also have no invulnerable duration, when the players collide they will grow/shrink rapidly.

This problem was mentioned quite a few times in these issues:

• Create "invulnerable" status #381
• Invulnerable players cannot shrink or grow #382
• Players lose invulnerability after a short time #463
• Players have an invulnerability duration #469

Lets track them here and solve it, it should be done before we could have a minimal viable game, because size matters.

[TheoPannetier]

Took the freedom of assigning myself to move forward, let me know if you still wanted to work on this!