Change default exposure, adjust a few examples

[GitGhillie]

(edit: all examples adjusted now)

Want to see if I'm on the right track before going all in 😅
Adjusted 3d_scene, load_gltf, lighting and skybox examples.

Let me know if comparison screenshots would help

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[JMS55]

Thanks so much for doing this! All 4 look good to me :)

[GitGhillie]

I'll update this comment with my progress 😃

100% of examples adjusted:
3d 3d_gizmos
3d 3d_scene
3d 3d_shapes
3d 3d_viewport_to_world
3d anti_aliasing
3d atmospheric_fog
3d blend_modes
3d bloom_3d
3d deferred_rendering
3d fog
3d generate_custom_mesh
3d lighting
3d lines
3d load_gltf
3d orthographic
3d parallax_mapping
3d parenting
3d pbr
3d render_to_texture
3d shadow_biases
3d shadow_caster_receiver
3d skybox
3d spherical_area_lights
3d split_screen
3d spotlight
3d ssao
3d tonemapping
3d transmission
3d transparency_3d
3d two_passes
3d update_gltf_scene
3d vertex_colors
3d wireframe
animation animated_fox
animation animated_transform
animation cubic_curve
animation custom_skinned_mesh
animation gltf_skinned_mesh
animation morph_targets
audio spatial_audio_3d
ecs iter_combinations
games alien_cake_addict
mobile bevy_mobile_example
shader array_texture
shader extended_material
shader post_processing
shader shader_material_screenspace_texture
shader shader_prepass
stress_tests many_cubes
stress_tests many_foxes
stress_tests many_lights
tools scene_viewer
transforms 3d_rotation
transforms scale
transforms transform
transforms translation
window low_power
window multiple_windows
window screenshot

[JMS55]

Btw coreh fixed the transmission example in case you missed it: GitGhillie#1. Thanks for all the great progress!

[GitGhillie]

Ah yeah thanks I missed it. That's one more down!

[GitGhillie]

Done. I will write some notes in the main PR

[coreh]

Fixed the atmospheric fog example: GitGhillie#2

[JMS55]

Thanks for all the work! I'll have to rebase this PR, some stuff with environment maps changed recently. Then we can see about getting this merged into bevy proper.