Rename internal types:

a suffix ending with _ct means confidential type
ans is reserved for M*LIB internal usage.

OPLIST doesn't use the external types
but rather the internal types.
It enables to be independent of the real names
of the external types.
Such external names are planned to be fully customizable
(i.e. the user may define a name that suits its coding style)

tests/test-msnapshot.c

@@ -150,7 +150,7 @@ static void test_global(void)
 
 static void test_mrsw_int1(void)
 {
-  snapshot_mrsw_int_t idx;
+  snapshot_mrsw_int_ct idx;
   snapshot_mrsw_int_init(idx, 1);
 
   assert (snapshot_mrsw_int_get_write_idx(idx) == 1);
@@ -180,7 +180,7 @@ static void test_mrsw_int1(void)
 
 static void test_mrsw_int2(void)
 {
-  snapshot_mrsw_int_t idx;
+  snapshot_mrsw_int_ct idx;
   snapshot_mrsw_int_init(idx, 2);
 
   assert (snapshot_mrsw_int_get_write_idx(idx) == 1);