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)

composer.json

@@ -15,5 +15,19 @@
         }
     ],
     "minimum-stability": "dev",
-    "require": {}
+    "require": {
+        "php": ">=8.1"
+    },
+    "require-dev": {
+        "phpstan/phpstan": "1.10.x-dev",
+        "phan/phan": "v5.x-dev",
+        "phpunit/phpunit": "^9",
+        "egrajp/smarty-extended": "^4.3"
+    },
+    "repositories": {
+        "git.egplusww.jp.Composer": {
+            "type": "composer",
+            "url": "https://git.egplusww.jp/api/packages/Composer/composer"
+        }
+    }
 }