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/configs/config.other.php

@@ -0,0 +1,35 @@
+<?php // phpcs:ignore PSR1.Files.SideEffects
+
+/********************************************************************
+* AUTHOR: Clemens Schwaighofer
+* CREATED: 2019/10/28
+* SHORT DESCRIPTION:
+* other global constant variables
+* HISTORY:
+*********************************************************************/
+
+declare(strict_types=1);
+
+// define('SOME_ID', <SOME VALUE>);
+
+/************* CONVERT *******************/
+// this only needed if the external thumbnail create is used
+$paths = [
+	'/bin',
+	'/usr/bin',
+	'/usr/local/bin',
+];
+// find convert
+foreach ($paths as $path) {
+	if (
+		file_exists($path . DIRECTORY_SEPARATOR . 'convert') &&
+		is_file($path . DIRECTORY_SEPARATOR . 'convert')
+	) {
+		// image magick convert location
+		define('CONVERT', $path . DIRECTORY_SEPARATOR . 'convert');
+		break;
+	}
+}
+unset($paths);
+
+// __END__