CRM_Mosaico_Utils - Cleanup code style (NFC)
CRM_Mosaico_Utils - Cleanup code style (NFC)

This resolves a huge number of style issues reported by `civilint`, although
it does leave a few more involving a peculiar use of `case X: {...}`.

veda-consulting/uk.co.vedaconsulting.mosaico,rocxa/uk.co.vedaconsulting.mosaico,rocxa/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,rocxa/uk.co.vedaconsulting.mosaico,rocxa/uk.co.vedaconsulting.mosaico