Add Position=0 to most response write functions

[Badgerati]

Description of the Change

Add Position = 0 to the -Value parameter of most Response Write functions, so supplying a simple value with no parameter name works.

Related Issue

Resolves #974

Examples

Write-PodeJsonResponse @{ Name = 'John' }

# as a short hand for:
Write-PodeJsonResponse -Value @{ Name = 'John' }