[feature] Handle effects

[Derpius]

Is your feature request related to a problem? Please describe.
Effects will render as melons

Describe the solution you'd like
We can't just blindly use the prop_dynamic stored in an effect, as the user may pass those entities explicitly.
The only possible solutions involve disabling rendering of an effect's model, then either requiring the user to explicitly pass the prop_dynamic (easy solution with obvious behaviour), or get the real entity off the effect and check whether the user already passed it explicitly (complex solution and the behaviour is inconsistent depending on whether you pass a dynamic prop along with an effect SENT.

I'll probably go with the former

[Derpius]

Added in 1a061c2