Ability to spawn/destroy lights and control light parameters

[saihv]

About

This PR adds the ability to spawn blueprints in the world along with static mesh actors. Additionally, it introduces a couple of sample blueprint wrappers for a Point light and a Spot light, and allows spawning or destroying them - which could be useful for dynamic changes in indoor environments. This method of control wraps the lights in a blueprint (see Content/Blueprints/Lights) that allows for spawning as well as easier, extensible control.

The main thing to note is that to be able to use this API, the light being targeted should be a blueprint.

A new API function simSetLightIntensity() allows for changing the brightness of the lights. Example usage of the entire pipeline can be seen in PythonClient/environment/light_control.py

• Ability to spawn blueprints
• Brightness control
• Color control
• Unity placeholder API

How Has This Been Tested?

Drag Blueprints/Lights/PointLightBP.uasset into any world (e.g. Blocks), and then run PythonClient/environment/light_control.py

Video:

2021-08-27.18-58-19-1.mp4

[rajat2004]

I'm making almost the same changes in spawnObject in #3940 😆 (apart from the is_blueprint)
The API needs to be added in RpcLibClientBase and Unity files also

[zimmy87]

some style comments

[LolkerXD]

😂