4.8.6

New features

[af34609] Introduced new ea.form.error JavaScript event (Sergii Dolgushev)
[92e5475] Make SecurityVoter implement supportsAttribute() to improve performance (@rneuter)
[ad607d7] Introduce MenuFactoryInterface to allow multi-level submenus (@IndyDevGuy)
[dc6395c] Add a new search mode to query all/any terms (@tasiot)
[80ef1a2] Tweak the style of the dark theme to make it look darker (@javiereguiluz)

Bug fixes

[ed2cbbc] Check if is stream wrapper in FileUploadType (Loïc)
[d66ff09] Fix country field flags in Safari browsers (@javiereguiluz)
[14d5d4c] Add missing label to arrayfield entry items (@mgrundkoetter)
[b49714a] Continue throwing same exception when edit entity (@abozhinov)
[7003ee7] Pass the original value to formatValue() method (@javiereguiluz)
[c3b68b0] Misc doc fixes (@jmeyo)