Fix typos, grammar, and some whitespace issues

Found via `codespell -q 2 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,ba,beginn,behaviour,bloaded,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childs,colour,colours,commen,currenty,dof,doubleclick,dum,eiter,elemente,feld,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,orgin,orginx,orginy,ot,pard,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,uint,unter,vertexes,wallthickness,whitespaces -S ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml`

src/Mod/Arch/OfflineRenderingUtils.py

@@ -301,7 +301,7 @@ def render(outputfile,scene=None,camera=None,zoom=False,width=400,height=300,bac
 
     # On Linux, the X server must have indirect rendering enabled in order to be able to do offline
     # PNG rendering. Unfortunately, this is turned off by default on most recent distros. The easiest
-    # way I found is to edit (or create if inexistant) /etc/X11/xorg.conf and add this:
+    # way I found is to edit (or create if inexistent) /etc/X11/xorg.conf and add this:
     #
     # Section "ServerFlags"
     #    Option "AllowIndirectGLX" "on"

src/Mod/Cloud/App/AppCloud.cpp

@@ -670,7 +670,7 @@ bool Cloud::Module::cloudRestore (const char *BucketName)
                                   (const char*)this->TcpPort.getStrValue().c_str(),
                                   BucketName);
 
-    // we shall pass there the intial Document.xml file
+    // we shall pass there the initial Document.xml file
 
     Base::XMLReader reader("Document.xml", myreader.GetEntry("Document.xml")->FileStream);
 
@@ -707,4 +707,3 @@ bool Cloud::Module::cloudRestore (const char *BucketName)
     return(true);
 
 }
-

src/Mod/Draft/importDXF.py

@@ -1986,7 +1986,7 @@ def addText(text, attrib=False):
         It defaults to `False`. If `True` it determines
         the layer name from the DXF code 8, the text value from code 1,
         the position from codes 10, 20, 30, the height from code 40,
-        the roation from code 50, and assigns the name `'Attribute'`.
+        the rotation from code 50, and assigns the name `'Attribute'`.
         Otherwise, it assumes these values from `text`
         and sets the name to `'Text'`.
 
@@ -2910,7 +2910,7 @@ def getArcData(edge):
     -------
     (tuple, float, float, float)
         It returns a tuple of four values; the first value is a tuple
-        with the cordinates of the center `(x, y, z)`;
+        with the coordinates of the center `(x, y, z)`;
         the other three represent the magnitude of the radius,
         and the start and end angles in degrees that define the arc.
 
@@ -3573,7 +3573,7 @@ def export(objectslist, filename, nospline=False, lwPoly=False):
 
     Returns
     -------
-    It returns `None` if the export is succesful.
+    It returns `None` if the export is successful.
 
     See also
     --------

src/Mod/Show/TempoVis.py

@@ -194,7 +194,7 @@ class TempoVis(object):
     def restore(self, ultimate = True):
         '''restore(ultimate = True): undoes all changes done through this tempovis / restores saved scene details.
         ultimate: if true, the saved values are cleaned out, and the TV is withdrawn from 
-        the stack. If false, the TV will still remember stuff, and resore can be called again.
+        the stack. If false, the TV will still remember stuff, and restore can be called again.
         '''
         if self.state == S_RESTORED:
             return
@@ -525,4 +525,3 @@ class TempoVis(object):
         self._init_attrs()
     
         
-

src/Mod/TechDraw/Gui/QGIPrimPath.h

@@ -91,8 +91,8 @@ protected:
     Qt::PenCapStyle m_capStyle;
 
     QBrush m_brush;
-    Qt::BrushStyle m_fill;                      //current fille style
-    Qt::BrushStyle m_fillStyle;                 //current fill style*/
+    Qt::BrushStyle m_fill;                      //current fill style
+    Qt::BrushStyle m_fillStyle;                 //current fill style
     QColor m_fillColor;                         //current fill color
 
     QColor m_colDefFill;                        //"no color" default normal fill color