Revert "removing all forced versions from gemspec"

This reverts commit 54d861020385760702669d00a91697b1e181225a.
[#65820930] move search bar to header
[#64337262] use thumb image in content block image list

maintain reference to original source for Insert Image dialog
touching file
[#65827192] newly added content blocks should appear as new tab

previously content was inserted before the tab area
[#65912028] clean up assets in first content block UI

align UI with current behavior (all assets in first content block)
[#65986896] try and make drag+drop sorting a bit less wonky
[#55643860] adapt image insert wizard w/ app's image versions
giving content links for preview a param of ?preview=true so we can cache differently
setting original file asset width and height
adding categories and tags to more like this
[fixes #73416986] cmd-s saves on all primary forms
[fixes #71499104] new content blocks in tabs always
[fixes #70277036] unsaved changes updates too often
merging in master changes