* Add new file 'network_traffic_filter.c/.h"
* Add feature to drop or accept specific packet transmit over edge network interface by rules.
* fix CMakeLists.txt typo
* Update Rule String Format
* replace -F (filter) with -R (rule) for traffic restrictions.
* Update edge help (-h) message. Update documents.
* Pass Build on CircleCI and local Windows 10 VS2019
* Fix cmake build failed because of sn_selection
* fix operate void* cause vs2016 build failed
* Fix typo to pass build on windows.
* add inttypes.h for n2n_typedefs.h to pass windows build
* modify headers to pass build on windows.
1. Automatically assign IP addresses to the edge through the DHCP function that comes with sn, the default IP address pool is 172.17.12.0/24.
2. The -d parameter is added to sn, and the IP address pool of the embedded DHCP can be customized.
3. Now edge does not need to add -a and -s parameters to automatically obtain the IP address.
4. The IP automatically obtained by the cross-community edge can be the same, because the communities are isolated from each other and do not interfere with each other.
5. On the management side of sn (127.0.0.1:5645), you can now view the IP address of the tutap adapter of each edge.
6. Fix many bugs that have a certain chance of causing memory leaks.
7. Note: This version is not fully compatible with the previous version.
