Inherit parent vars and add own vars when a template is included with vars from another template that has vars; add unit tests for vars inheritance

tests/_data/template/incl/scopetest1.html

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+<config version="2" />
+<div>{{ $foobar }}</div>
+<div>{{ $globalonly }}</div>

tests/_data/template/incl/scopetest2.html

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+<config version="2" />
+<div class="self">{{ $foobar }}</div>
+<div class="incl">
+	<include src="incl/scopetest1.html" vars="['foobar' => 'Included #3']" />
+</div>

tests/_data/template/v2varscope.executed.html

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+
+<div class="global">
+	<div>Rhymix Template</div>
+	<div>Context Variable</div>
+</div>
+
+<div class="test1">
+	<div>Included #1</div>
+	<div></div>
+</div>
+
+<div class="test2">
+	<div class="self">Included #2</div>
+	<div class="incl">
+		<div>Included #3</div>
+		<div></div>
+	</div>
+</div>

tests/_data/template/v2varscope.html

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+@version(2)
+
+@php
+	$foobar = 'Rhymix Template';
+	$globalonly = 'Context Variable';
+@endphp
+
+<div class="global">
+	@include ('incl/scopetest1.html')
+</div>
+
+<div class="test1">
+	@include ('incl/scopetest1.html', ['foobar' => 'Included #1'])
+</div>
+
+<div class="test2">
+	@include ('incl/scopetest2.html', ['foobar' => 'Included #2'])
+</div>