Remove stringex from frontend gemspec its in core already.
Bump to final release instead of rc.
Fixes #4905: Error while trying to set "weight" in Variant with "," as seperator.

Fixes #4905
Fixes #4939
Refactor number parsing to be DRY. Fixes #4939
Fixes product validation on create. Fixes #5588
Remove file that shouldnt exist.
Give spec correct title.

fixes #5614
Allow Admins To Flush Rails Cache
fixes #5615
Check for Deleted Variants In Line Items

me fail english, that umpossible

change is_removed to is_destroyed

fixes #5611