Xsolla Store Unity Asset v0.6.2.0

[Added] Social friends system functionality
[Added] Coupon functionality
[Added] Bundle functionality
[Added] Additional API methods
[Added] Catalog pagination
[Added] Inventory SDK demo
[Added] User profile functionality
[Added] Virtual currency consumption functionality
[Added] Friends search functionality
[Changed] Analitycs implementation
[Fixed] Demo user button behavior
[Fixed] Unity Editor crash after updating plugin