New developer command to test all third-party extensions

* `composer run-script phpstan-third-party`
* Rename the directory for generate.php to `third-party` instead of `tmp`
* Take advantage of PHPStan checkMissingOverrideMethodAttribute https://phpstan.org/config-reference#checkmissingoverridemethodattribute
* Detected and fixed bug in URL of https://github.com/tunbridgep/freshrss-invidious

phpstan-third-party.neon

@@ -0,0 +1,24 @@
+parameters:
+	level: 0
+	treatPhpDocTypesAsCertain: false
+	fileExtensions:
+		- php
+		- phtml
+	paths:
+		- ../FreshRSS
+		- third-party/
+	excludePaths:
+		analyse:
+			- ../FreshRSS
+			- third-party/*/vendor/*
+		analyseAndScan:
+			- .git/
+			- node_modules/
+			- symbolic/
+			- third-party/*/tests/*
+			- tmp/
+			- vendor/
+			- xExtension-*
+	dynamicConstantNames:
+		- TYPE_GIT
+	reportMaybesInPropertyPhpDocTypes: false