Fix spelling errors

Most errors found with:

codespell -L cach,thst,odly,aslo,parm,parms,inpu,ges,prset,pevent,ptd,pring,valu,noo,noe,ned,inout,ro,siz,froms,nd,fo,singl,sart,multy,tthe,allong,ment,inate,nodel,tring,alse,ture,thi,wille,numer

Some more manually found (its -> it's)

c++20: Do not use apostrophe (e.g. can't) in unquoted #error message

modules/ca/src/client/searchTimer.cpp

@@ -353,7 +353,7 @@ void searchTimer::uninstallChanDueToSuccessfulSearchResponse (
                     // when we get 100% success immediately
                     // send another search request
                     //
-                    debugPrintf ( ( "All requests succesful, set timer delay to zero\n" ) );
+                    debugPrintf ( ( "All requests successful, set timer delay to zero\n" ) );
                     this->timer.start ( *this, currentTime );
                 }
             }