Factor out the TreeView parse tree printing module into a separate file.

FossilOrigin-Name: c32ce54ca46a4be4373983be6fd44b1f3a0250d1

tool/mksqlite3c.tcl

@@ -289,6 +289,7 @@ foreach file {
    mutex_w32.c
    malloc.c
    printf.c
+   treeview.c
    random.c
    threads.c
    utf.c