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)

phpstan-conditional.php

@@ -0,0 +1,21 @@
+<?php
+
+// conditional formats for PHP versions
+
+declare(strict_types=1);
+
+$config = [];
+
+if (PHP_VERSION_ID >= 8_00_00) {
+	// Change of signature in PHP 8.1
+	/* $config['parameters']['ignoreErrors'][] = [
+		'message' => '~Parameter #1 \$(result|connection) of function pg_\w+ '
+			. 'expects resource(\|null)?, object\|resource given\.~',
+		'path' => 'www/lib/CoreLibs/DB/SQL/PgSQL.php',
+		// 'count' => 1,
+	]; */
+}
+
+return $config;
+
+// __END_