Misc. typo & whitespace fixes

Found via `codespell -q 3 -I ../fc-word-whitelist.txt --skip="*.ts,*.po,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./.git,./src/zipios++"`
Revert IFC commit

src/Base/Parameter.cpp

@@ -215,7 +215,7 @@ ParameterGrp::~ParameterGrp()
 
 void ParameterGrp::copyTo(Base::Reference<ParameterGrp> Grp)
 {
-    // delete previos content
+    // delete previous content
     Grp->Clear();
 
     // copy all