VarSetType rename to SetVarType, add phan/phpstan/phpunit tests

Breaking change:
VarSetType/VarSetTypeNull classes have been renamed to
SetVarType/SetVarTypeNull

Added phan/phpstan static checkes and settings
Add phpunit tests (in test/phpunit) that are an exact copy from the
trunk folder unit tests

The phan/phpstan tests have been updated to work with the composer layout

config files with static defines needed for certain classes are stored
in test/configs (config.php, config.other.php, config.master.php)

test/phpunit/CoreLibsAdminBackendTest.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace tests;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test class for Admin\Backend
+ * @coversDefaultClass \CoreLibs\Admin\Backend
+ * @testdox \CoreLibs\Admin\Backend method tests
+ */
+final class CoreLibsAdminBackendTest extends TestCase
+{
+	/**
+	 * Undocumented function
+	 *
+	 * @return void
+	 */
+	protected function setUp(): void
+	{
+		if (!extension_loaded('pgsql')) {
+			$this->markTestSkipped(
+				'The PgSQL extension is not available.'
+			);
+		}
+	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @testdox Admin\Backend Class tests
+	 *
+	 * @return void
+	 */
+	public function testAdminBackend()
+	{
+		/* $this->assertTrue(true, 'ACL Login Tests not implemented');
+		$this->markTestIncomplete(
+			'ACL\Login Tests have not yet been implemented'
+		); */
+		$this->markTestSkipped('No implementation for Admin\Backend at the moment');
+	}
+}
+
+// __END__