Auto find and lose of devices, other improvements

Created a small test app and improved the NetworkEnvironment. All
devices have now names to humanly identify them.

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Known issues: Sometimes the register or unregister broadcast get lost
(received only by localhost or even fully lost). The problem seems to
last about 30s and then disappears. Tried to repeat the broadcasts with
no luck (3 to 5 times with 2ms to 100ms gaps). Network errors and UDP?
Test in other networks are necessary.