devices: add devices in Command::importTable()

Add a device_table parameters to Command::importTable() and
add_imported_dives(). The content of this table will be added
to the global device list (respectively removed on undo).

This is currently a no-op, as the parser doesn't yet fill
out the device table, but adds devices directly to the global
device table.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

core/device.cpp

@@ -416,3 +416,13 @@ extern "C" const char *device_get_nickname(const struct device *dev)
 {
 	return dev ? dev->nickName.c_str() : NULL;
 }
+
+extern "C" struct device_table *alloc_device_table()
+{
+	return new struct device_table;
+}
+
+extern "C" void free_device_table(struct device_table *devices)
+{
+	delete devices;
+}