patch 8.2.0256: time and timer related code is spread out

Problem:    Time and timer related code is spread out.
Solution:   Move time and timer related code to a new file. (Yegappan
            Lakshmanan, closes #5604)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index da9a911..fd7a6ab 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -799,6 +799,7 @@
 	$(OUTDIR)\term.obj \
 	$(OUTDIR)\testing.obj \
 	$(OUTDIR)\textprop.obj \
+	$(OUTDIR)\time.obj \
 	$(OUTDIR)\ui.obj \
 	$(OUTDIR)\undo.obj \
 	$(OUTDIR)\usercmd.obj \
@@ -1733,6 +1734,8 @@
 
 $(OUTDIR)/textprop.obj:	$(OUTDIR) textprop.c  $(INCL)
 
+$(OUTDIR)/time.obj:	$(OUTDIR) time.c  $(INCL)
+
 $(OUTDIR)/ui.obj:	$(OUTDIR) ui.c  $(INCL)
 
 $(OUTDIR)/undo.obj:	$(OUTDIR) undo.c  $(INCL)
@@ -1926,6 +1929,7 @@
 	proto/term.pro \
 	proto/testing.pro \
 	proto/textprop.pro \
+	proto/time.pro \
 	proto/ui.pro \
 	proto/undo.pro \
 	proto/usercmd.pro \