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

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* 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/Mod/Spreadsheet/App/PropertySheet.cpp

@@ -137,8 +137,9 @@ bool PropertySheet::isValidAlias(const std::string& candidate)
         return false;
     }
 
-    /* Check to make sure it doesn't clash with a predefined unit */
-    if (ExpressionParser::isTokenAUnit(candidate)) {
+    /* Check to make sure it doesn't clash with a reserved name */
+    if (ExpressionParser::isTokenAUnit(candidate)
+        || ExpressionParser::isTokenAConstant(candidate)) {
         return false;
     }