Make keyframes easier to select in the animation easier

Keyframe SVG icons are now 10×10 instead of 8×8 (except for
Bezier-related icons). This makes them easier to select
since the empty space is part of the clickable area.

Selected keyframes are now also visually larger to make them
easier to distinguish from unselected keyframes.

This closes #27276.

editor/icons/icon_key_animation.svg

@@ -1,65 +1 @@
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editor/icons/icon_key_audio.svg

@@ -1,65 +1 @@
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editor/icons/icon_key_bezier.svg

@@ -1,65 +1 @@
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editor/icons/icon_key_call.svg

@@ -1,64 +1 @@
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editor/icons/icon_key_selected.svg

@@ -1,76 +1 @@
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editor/icons/icon_key_value.svg

@@ -1,5 +1 @@
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editor/icons/icon_key_xform.svg

@@ -1,64 +1 @@
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