Revert "VE-821 Remove debugging"

This reverts commit 731650ea51bc904c71b135ed2ddabc202c0d7202.
Revert "VE-821 Do not use 'memory' flag for the ve.activationComplete hook"

This reverts commit b31ba653280d9486f0f329ac7cf2b5bd964d8a19.
Revert "VE-821 Make callbacks flag optional in mw.hook calls"

This reverts commit 57a0e89bfc70eacc46247a20189b40f90b2ddbad.
VE-821 Fix disappearing loading indicator