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Implement ThumbSequenceCreator instead of ThumbCreator, to support generating
thumbs for multiple frames of a video file, based on sequenceIndex().

Also add some primitive runtime caching to avoid creating thumbs again when
the sequence wraps around.

The seek percentages of the sequence frames and the cache size are
configurable.

BUG: 430266

So that they can be turned off using the Qt logging rules.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

Commit d2ab28b9 assumes taglib is a required dependency.
This change should have been part of that commit.

Taglib can always be made optional if desired, but it shouldn't be
a problem to require it.

BUG: 408956

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"