fix bugprone-*

* bugprone-throw-keyword-missing
* bugprone-unhandled-self-assignment
* bugprone-suspicious-string-compare
* bugprone-reserved-identifier
* bugprone-narrowing-conversions
* bugprone-macro-parentheses
* bugprone-implicit-widening-of-multiplication-result
* bugprone-exception-escape
* bugprone-copy-constructor-init

src/Base/Matrix.h

@@ -320,6 +320,10 @@ inline Matrix4D Matrix4D::operator*(const Matrix4D& mat) const
 
 inline Matrix4D& Matrix4D::operator=(const Matrix4D& mat)
 {
+    if (this == &mat) {
+        return *this;
+    }
+
     for (int iz = 0; iz < 4; iz++) {
         for (int is = 0; is < 4; is++) {
             dMtrx4D[iz][is] = mat.dMtrx4D[iz][is];