Update 2D demos for 3.2 and convert many to GLES 2 #414
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While GLES 2 was added in Godot 3.1, it got significant improvements in 3.2. I think we should be using it for many of the demo projects since it is pretty good now. This also helps with future proofing for when we eventually port the demos to Godot 4.0.
These demos weren't converted to GLES 2:
Dodge the Creeps: Particles don't work in GLES 2.
Particle Systems: Particles don't work in GLES 2.
HDR for 2D: HDR is not available in GLES 2.
SDF Font demo: This effect doesn't work in GLES 2.
Platformer or physics platformer: Modified in another PR, so I won't touch them for now.
The 2D lighting demo looks different in GLES 2 due to a lack of HDR, but I decided to convert it since it looks roughly the same after tweaking. The lights were slightly dimmed.
The 2D sprite shaders demo looks different in GLES 2, specifically the glow effect, but I decided to convert it since it looks roughly the same after tweaking. The glow was slightly reduced.
Aside from that, this PR is just routine updates, opening and saving each scene, etc. The only demo that required significant fixes was the isometric demo since isometric tilemaps changed in 3.2. Therefore, this fixes #378.