Projected video texture

[Nbc66]

This PR adds the ability to have Bink video be able to be used with projected textures

This adds a new entity called env_projectedvideo

Here is a quick video of it in action

Half.Life.Source.2026.03.11.-.23.05.14.01.mp4

Example FGD entry:

@PointClass base(env_projectedtexture) studio("models/editor/cone_projected_helper.mdl") frustum(lightfov,nearz,farz,lightcolor,-1) = env_projectedvideo :
    "Projected light that uses a video as the projection cookie"
[
    VideoFile(string) : "Video File" : "" : "Path to the video file (ex: media/projector.bik)"
]

also this pr adds a small edit to the flashlight shader to just clip off the sides of the shader projection that isnt used otherwise you would get artifacting like this

Note:

There is an issue with video materials where its imposible to actualy set the time of the curent video material making saving and restoring at the same time point impossible i would love to get that fixed but its sadly not possible for now people can use it as decoration or just dissalow saving while the video is playing for any in game reason if they dont want people to auto reload the video when they reload a save

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PR Checklist

• My PR follows all guidelines in the CONTRIBUTING.md file
• My PR targets a develop branch OR targets another branch with a specific goal in mind