Update miew to webgl 2

[NadezhdaKatcman]

Description

Solves #631
Minimal updates were done to move from WebGL1 to WebGL2

• Additionally some shaders were moved to GLSL 3 (comments were added to all shaders to easily get used in them glsl versions)

Type of changes

None from suggested. WebGL update with no breaking changes and changes in behavior at all (hopefully)

Checklist

• I have read CONTRIBUTING and CODE_OF_CONDUCT guides.
• I have followed the code style of this project.
• I have run yarn run ci: lint and tests pass locally with my changes.
• The changes do not require updated tests.
• The changes do not require updated docs.
• Checked that actual stereo modes are not broken ('SIMPLE', 'DISTORTED', 'ANAGLYPH')

[NataliaDSmirnova]

Looks great! Thank you 🫶