Virtual Meeting Software Market Size, Share & COVID-19 Impact Analysis, By Type (VR Headset, Without VR Headset), By Function (Virtual Event, Video Conferencing, Mobile Event App, Event Management, Lead Retrieval, Attendee Management, Gamification, and Others), By Deployment (On-premises and Cloud), By Enterprises Size (Small & Medium Enterprises and Large Enterprises), By Industry and Regional Forecast, 2020-2027