feat: add "Last Updated" column to search results

Mario Oenningrequested to merge
moson/aurweb:packages-lastupdate into master

Adds Last Updated to the package search result list.
We use a red text color to highlight flagged packages (similar to the Version column)

Preview:

image

image

Feature request: #371 (closed)

Signed-off-by: moson-mo mo-son@mailbox.org

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