Prevent using reserved names for properties or aliases (Fix #16846) (#16902)

* Prevent naming properties with reserved words (Fix #16846)

* Prevent using reserved constant names for properties or aliases

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* App: Add unit test for isTokenAConstant

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

src/Gui/DlgExpressionInput.cpp

@@ -437,6 +437,11 @@ static bool isNamePropOk(const QString& nameProp, App::DocumentObject* obj,
         return false;
     }
 
+    if (ExpressionParser::isTokenAUnit(name) || ExpressionParser::isTokenAConstant(name)) {
+        message << name << " is a reserved word";
+        return false;
+    }
+
     auto prop = obj->getPropertyByName(name.c_str());
     if (prop && prop->getContainer() == obj) {
         message << name << " already exists";