Since multiple dict tags can be in a plist, not just the top level, need to be able to specify to only insert once.

Adding an optional once="true" attribute to these commands in UPL will allow this.

Steps to Reproduce

1. Create iOS code project
2. Add this to the project's Build.cs:

if (Target.Platform == UnrealTargetPlatform.IOS)
                string PluginPath = Utils.MakePathRelativeTo(ModuleDirectory, BuildConfiguration.RelativeEnginePath);
                AdditionalPropertiesForReceipt.Add(new ReceiptProperty("IOSPlugin", Path.Combine(PluginPath, "Test_UPL.xml")));

And add this Test_UPL.xml file:

<?xml version="1.0" encoding="utf-8"?>
	<!-- init section is always evaluated once per architecture -->
		<log text="Test UPL init"/>
		<setString name="APIKey" value="testkey"/>
		<!-- Add ApiKey -->
		<addElements tag="dict" once="true">
		<setElement result="FabricKey" xml="&lt;dict&gt;&lt;key&gt;APIKey&lt;/key&gt;&lt;string&gt;$S(APIKey)&lt;/string&gt;&lt;key&gt;Kits&lt;/key&gt;&lt;array&gt;&lt;dict&gt;&lt;key&gt;KitInfo&lt;/key&gt;&lt;dict/&gt;&lt;key&gt;KitName&lt;/key&gt;&lt;string&gt;Crashlytics&lt;/string&gt;&lt;/dict&gt;&lt;/array&gt;&lt;/dict&gt;"/>
		<addElement tag="dict" name="FabricKey" once="true"/>

3. Package for iOS and look at the plist file to make sure the fabric key is only inserted once instead of for every dict block.

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ComponentUE - Platform - Mobile
Affects Versions4.174.18
Target Fix4.17
Fix Commit3569317
Main Commit3596628
Release Commit3569317
CreatedAug 1, 2017
ResolvedAug 2, 2017
UpdatedSep 16, 2019
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