feat: new macros (mp_reseterror and mp_init), new datetime format added to mp_getcols, and stub prepared for mp_makedata

tests/crossplatform/mp_lockfilecheck.test.sas

@@ -5,6 +5,7 @@
   <h4> SAS Macros </h4>
   @li mp_lockfilecheck.sas
   @li mp_assert.sas
+  @li mp_reseterror.sas
 
 **/
 
@@ -29,6 +30,8 @@ data work.test; a=1;run;
 
 %mp_lockfilecheck(sashelp.class)
 
+%mp_reseterror()
+
 %mp_assert(
   iftrue=(&success=1),
   desc=Checking sashelp table cannot be locked,