Bootstrap server

[MattSkala]

Added tracker module allowing to run a custom bootstrap server (a JVM alternative to https://github.com/Tribler/py-ipv8/blob/master/scripts/tracker_plugin.py)

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #11      +/-   ##
============================================
+ Coverage     76.15%   76.38%   +0.23%     
- Complexity      465      475      +10     
============================================
  Files            54       54              
  Lines          1799     1804       +5     
  Branches        244      245       +1     
============================================
+ Hits           1370     1378       +8     
+ Misses          284      278       -6     
- Partials        145      148       +3     

Impacted Files	Coverage Δ	Complexity Δ
ipv8/src/main/java/nl/tudelft/ipv8/Community.kt	79.23% <0.00%> (+0.66%)	55.00% <0.00%> (+2.00%)	⬇️
...main/java/nl/tudelft/ipv8/peerdiscovery/Network.kt	81.81% <0.00%> (+3.40%)	38.00% <0.00%> (+1.00%)	⬇️

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