[BUGFIX] #236 Fix bugs in PHP 7.0

Classes/Hook/HandleTemplateAfterTcaSave.php

Classes/Service/ExtensionSettingsService.php

Classes/Service/JsonImportService.php

Classes/Service/StaticFileGenerationService.php

Classes/Service/TemplateService.php

Contrib/jsqueeze/src/JSqueeze.php

Contrib/minify/src/JS.php

Contrib/mustache/bin/build_bootstrap.php

Contrib/mustache/src/Mustache/Compiler.php

Contrib/mustache/src/Mustache/Engine.php

Contrib/mustache/src/Mustache/Logger.php

Contrib/mustache/src/Mustache/Tokenizer.php

...e/test/Mustache/Test/FiveThree/Functional/FiltersTest.php