Misc. typo fixes

Found via `codespell -q 3 -I ../fc-word-whitelist.txt -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 -L pard,wallthickness,commen,byteorder,alocation`

src/Base/UnitsSchemaMmMin.h

@@ -33,7 +33,7 @@ namespace Base {
 
 
 /*  Metric units schema intended for design of small parts and for CNC
- *  Lengths are alwais in mm.
+ *  Lengths are always in mm.
  *  Angles in degrees (use degree symbol)
  *  Velocities in mm/min (as used in g-code).
  */

src/Gui/GestureNavigationStyle.cpp

@@ -375,14 +375,14 @@ public:
 
     }
     virtual ~AwaitingMoveState(){
-        //always clear posponed events when leaving this state.
+        //always clear postponed events when leaving this state.
         this->outermost_context().ns.postponedEvents.discardAll();
     }
 
     sc::result react(const NS::Event& ev){
         auto &ns = this->outermost_context().ns;
 
-        ///refire(): forwards all posponed events + this event
+        ///refire(): forwards all postponed events + this event
         auto refire = [&]{
             ns.postponedEvents.forwardAll();
             ev.flags->processed = ns.processSoEvent_bypass(ev.inventor_event);

src/Mod/Draft/DraftGui.py

@@ -858,7 +858,7 @@ class DraftToolBar:
         self.xzButton.setText(translate("draft", "XZ (front)"))
         self.xzButton.setToolTip(translate("draft", "Sets the working plane on the front XZ plane"))
         self.yzButton.setText(translate("draft", "YZ (side)"))
-        self.yzButton.setToolTip(translate("draft", "Setsthe working plane on the side YZ plane"))
+        self.yzButton.setToolTip(translate("draft", "Sets the working plane on the side YZ plane"))
         self.currentViewButton.setText(translate("draft", "View"))
         self.currentViewButton.setToolTip(translate("draft", "Sets the working plane perpendicular to the current view"))
         self.resetPlaneButton.setText(translate("draft", "Automatic"))

src/Mod/Draft/DraftTools.py

@@ -327,7 +327,7 @@ class SelectPlane(DraftTool):
             self.finish()
         if arg["Type"] == "SoMouseButtonEvent":
             if (arg["State"] == "DOWN") and (arg["Button"] == "BUTTON1"):
-                # coin detection happens before the selection got a chance of being updated, sowe must delay
+                # coin detection happens before the selection got a chance of being updated, so we must delay
                 DraftGui.todo.delay(self.checkSelection,None)
 
     def checkSelection(self):
@@ -1030,7 +1030,7 @@ class CubicBezCurve(Line):
                             if ((self.point-self.node[0]).Length < Draft.tolerance()) and len(self.node) >= 4:
                                 #self.undolast()
                                 self.node=self.node[0:-2]
-                                self.node.append(2 * self.node[0] - self.node[1]) #close the curve with a smooth simmetric knot
+                                self.node.append(2 * self.node[0] - self.node[1]) #close the curve with a smooth symmetric knot
                                 self.finish(True,cont=True)
                                 FreeCAD.Console.PrintMessage(translate("draft", "Bezier curve has been closed")+"\n")
             if (arg["State"] == "UP") and (arg["Button"] == "BUTTON1"):       #left click

src/Mod/Draft/Resources/icons/Draft_CubicBezCurve.svg

@@ -499,7 +499,7 @@
             <rdf:li>square</rdf:li>
           </rdf:Bag>
         </dc:subject>
-        <dc:description>A curved line in the shape of an upside down U with a poitn at each end that has a square shaped control point</dc:description>
+        <dc:description>A curved line in the shape of an upside down U with a point at each end that has a square shaped control point</dc:description>
       </cc:Work>
     </rdf:RDF>
   </metadata>