Misc source comment typos

Found via `codespell -q 3 --skip="*.po,*.ts,./.git,./src/3rdParty,./src/CXX,./src/zipios++,./src/Mod/Assembly/App/opendcm" -I ~/Projects/fc-word-whitelist.txt`  
Whitelist consists of:
```
aline
alledges
als
ang
behaviour
bloaded
calculater
cancelled
cancelling
cas
centimetre
childs
colour
colours
doubleclick
dum
eiter
elemente
freez
iff
indicies
initialisation
initialise
initialised
initialises
kilometre
lod
mantatory
methode
metres
millimetre
modell
nd
normaly
nto
oder
ot
pres
que
recurrance
rougly
seperator
serie
strack
substraction
te
thru
vertexes
whitespaces
```

src/Mod/PartDesign/Gui/CommandBody.cpp

@@ -708,7 +708,7 @@ void CmdPartDesignMoveFeature::activated(int iMsg)
         return;
     }
 
-    // Collect dependenies of the selected features
+    // Collect dependencies of the selected features
     std::vector<App::DocumentObject*> dependencies = PartDesignGui::collectMovableDependencies(features);
     if (!dependencies.empty())
         features.insert(std::end(features), std::begin(dependencies), std::end(dependencies));