[Feature request] Integrate Blackbody settings into Emission note

[CodeFHD]

Submitted on Discord b SharlyBG.
Changes based on BlendLuxCore v2.11.0.

Placed here for now as a reminder until branches have been updated.

I was willing to make this change since quite sometimes now " Integrate Blackbody" settings
To Emission node so that the node is easier to use and require less click. Very usefull for Archviz
workflow. Tried to carefully "VC" it using GPT5.5 step by step with minimal change and very cautious
approach lead to this result :
You can use normal RGB input "Green'
Or Texture image
Or Blackbody

Instead of the old node which require additional node and clicks

sockets.py
emission.py