Fix regressions

[SimonDanisch]

• closes Animations: possible regression in colour updates using default colorscale and GLMakie #3096 . Turns out we need to be more careful with mutables + inplace mutation + ignore_equal_values in observables
• closes Cannot plot contours in both CairoMakie and GLMakie #3060. Also, should improve contour performance quite a bit!
• closes Plotting polygons with dashed and dotted strokestyle broken #3109
• Fix Scene tutorial

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(display(fig))

	using	create	display	create	display
GLMakie	10.92s (10.87, 11.03) 0.06+-	1.03s (1.02, 1.05) 0.01+-	738.61ms (725.18, 788.46) 22.46+-	9.65ms (9.53, 9.73) 0.07+-	141.01ms (139.85, 142.40) 0.90+-
master	10.95s (10.84, 11.05) 0.07+-	1.04s (1.00, 1.06) 0.02+-	743.63ms (735.49, 767.62) 11.32+-	9.74ms (9.63, 9.81) 0.07+-	140.48ms (139.59, 142.56) 1.04+-
evaluation	-0.26%, -0.03s invariant (-0.44d, 0.43p, 0.06std)	-0.89%, -0.01s invariant (-0.59d, 0.30p, 0.01std)	-0.68%, -5.02ms invariant (-0.28d, 0.61p, 16.89std)	-0.94%, -0.09ms faster ✓ (-1.32d, 0.03p, 0.07std)	+0.37%, 0.53ms invariant (0.55d, 0.33p, 0.97std)
CairoMakie	10.61s (10.55, 10.80) 0.09+-	1.03s (1.01, 1.05) 0.01+-	216.60ms (213.65, 221.32) 2.63+-	10.44ms (10.30, 10.55) 0.09+-	6.27ms (6.11, 6.42) 0.09+-
master	10.58s (10.55, 10.64) 0.04+-	1.02s (1.01, 1.04) 0.01+-	216.38ms (213.12, 218.40) 1.90+-	10.50ms (10.46, 10.62) 0.05+-	6.34ms (6.27, 6.40) 0.05+-
evaluation	+0.28%, 0.03s invariant (0.43d, 0.45p, 0.06std)	+0.37%, 0.0s invariant (0.35d, 0.53p, 0.01std)	+0.10%, 0.21ms invariant (0.09d, 0.86p, 2.27std)	-0.61%, -0.06ms invariant (-0.83d, 0.15p, 0.07std)	-1.05%, -0.07ms invariant (-0.92d, 0.12p, 0.07std)
WGLMakie	15.46s (15.15, 15.66) 0.18+-	1.41s (1.38, 1.44) 0.03+-	14.13s (14.02, 14.24) 0.07+-	16.79ms (15.89, 17.74) 0.71+-	1.41s (1.37, 1.44) 0.02+-
master	15.62s (15.46, 15.92) 0.15+-	1.44s (1.37, 1.53) 0.06+-	14.17s (14.03, 14.38) 0.13+-	17.34ms (16.20, 19.08) 0.88+-	1.40s (1.36, 1.43) 0.03+-
evaluation	-1.06%, -0.16s invariant (-0.99d, 0.09p, 0.16std)	-2.32%, -0.03s invariant (-0.70d, 0.23p, 0.04std)	-0.28%, -0.04s invariant (-0.39d, 0.49p, 0.10std)	-3.28%, -0.55ms invariant (-0.69d, 0.22p, 0.80std)	+0.90%, 0.01s invariant (0.51d, 0.36p, 0.02std)