Add AdditionalArguments flag

This flag allows you to provide additional arguments for unity command line. This is useful for cases where we do not support unity command line flags. It is also useful for providing arbitrary arguments alongside ExecuteMethod.

Author: MenelvagorMilsom

UnitySetup/UnitySetup.psm1

@@ -754,6 +754,8 @@ function Get-UnityProjectInstance {
    Force operation as though $PWD is not a unity project.
 .PARAMETER ExecuteMethod
    The script method for the Unity Editor to execute.
+.PARAMETER AdditionalArguments
+   Additiong arguments for Unity or your custom method
 .PARAMETER OutputPath
    The output path that the Unity Editor should use.
 .PARAMETER LogFile
@@ -825,6 +827,8 @@ function Start-UnityEditor {
         [parameter(Mandatory = $false)]
         [string]$ExecuteMethod,
         [parameter(Mandatory = $false)]
+        [string]$AdditionalArguments,
+        [parameter(Mandatory = $false)]
         [string[]]$ExportPackage,
         [parameter(Mandatory = $false)]
         [string]$ImportPackage,
@@ -962,6 +966,7 @@ function Start-UnityEditor {
         if ( $TestResults ) { $sharedArgs += '-testResults', $TestResults }
         if ( $RunTests ) { $sharedArgs += '-runTests' }
         if ( $ForceFree) { $sharedArgs += '-force-free' }
+        if ( $AdditionalArguments) { $sharedArgs += $AdditionalArguments }
 
         $instanceArgs = @()
         foreach ( $p in $projectInstances ) {