2.1.0 Milestone Release

• New syntax (?: default operator) supports fallback to RHS if the LHS is Boolean equivalent to false (PR #784)
• New syntax (?? coalescing operator) supports fallback to RHS if the LHS is non-existent (PR #784)
• Improve regex generation for DateTime parser (PR #728)
• Truncate fractional part of numeric argument of $pad function (PR #729)
• Await array elements (PR #747)
• Various documentation fixes and improvements