Bring back VSM Shadows

The next version right after 2.8 was released had some "improvements" on Eevee shadows, getting rid of ESM and VSM, and for a reason.

For beginners it was confusing and hard to get a good result with so many shadow settings, currently theres only a few settings for shadows and you can get a good result without much tweaking.

However, for users that already know what they are doing, not having those settings and not having VSM is a downside, because currently the shadows look worse than in 2.8 launch, not only shadows but volumetrics had less bleeding through walls ( probrably also because of the shadows being better ) and Ambient Occlusion had a much cleaner noise look, almost felt like film grain and it had a much sharper look overall, while now it looks very unrealistic and you want to get rid of the noise at all costs because it looks terrible, heres some comparassions :

Blender 2.8 : Now :

Heres how volumetrics and AO behave :

Blender 2.8 : Now :

Something to note though, other than Ambient occlusion, shadows and volumetric bleeding, everything else looks much better, volumetrics look smoother and have more control, Bloom has a higher definition now, and like said before, its easier for users to get an acceptable look.