IPv6 support

[GiantTreeLP]

This pull request includes:

• breaking changes (changed types and a changed method name)
• no breaking changes

Changes made to the repository:

This pull request changes part of the setup of the wrapper, allowing users to configure IPv6 and Dual Stack addresses (0.0.0.0).
On top of that, the API was changed to properly support Internet Addresses instead of strings.

Documentation of test results:

Test results:

• Configuration (only relevant parts):
  • Master:
    • config.yml:
      
    • services.json:
      
  • Wrapper:
    • config.yml:
      

Connections to the proxy in this configuration are able to be done over an internal IPv6 link.
Using 0.0.0.0 as the proxy-config-host yields dual-stack capabilities, allowing IPv4 and IPv6 connections.

Related issues/discussions:

This is a follow-up to #281.
Closes #275.

[GiantTreeLP]

Issues found by @deepcode-ci-bot will be fixed after merge.

[TheMeinerLP]

Looks good for me

[ghost]

DeepCode's analysis on #e7a9fe found:

• ⚠️ 2 warnings, ℹ️ 3 minor issues. 👇

Top issues

Description	Example fixes
Missing close on getInputStream leads to a resource leak. Occurrences: GameServer.java:217 GameServer.java:240 BungeeCord.java:245	🔧 Example fixes
Either rethrow this java.lang.InterruptedException or set the interrupted flag on the current thread with 'Thread.currentThread().interrupt()'. Otherwise the information that the current thread was interrupted will be lost. Occurrences: NetworkConnection.java:119 NetworkConnection.java:132 CloudNetWrapper.java:291	🔧 Example fixes
Printing the stack trace of java.io.IOException. Production code should not use printStackTrace. Occurrences: CloudNetWrapperConfig.java:159 CloudNetWrapperConfig.java:169 CloudServer.java:464	🔧 Example fixes

👉 View analysis in DeepCode’s Dashboard | Configure the bot

[byRoadrunner]

Here is an overview of what got changed by this pull request:

Issues
======
+ Solved 5
- Added 2
           

Complexity increasing per file
==============================
- cloudnet-wrapper/src/main/java/eu/cloudnetservice/cloudnet/v2/wrapper/server/BungeeCord.java  2
- cloudnet-lib/src/main/java/eu/cloudnetservice/cloudnet/v2/lib/process/ProxyProcessData.java  2
         

Complexity decreasing per file
==============================
+ cloudnet-wrapper/src/main/java/eu/cloudnetservice/cloudnet/v2/wrapper/CloudNetWrapperConfig.java  -8
+ cloudnet-lib/src/main/java/eu/cloudnetservice/cloudnet/v2/lib/server/ProxyProcessMeta.java  -1
         

Clones removed
==============
+ cloudnet-wrapper/src/main/java/eu/cloudnetservice/cloudnet/v2/wrapper/CloudNetWrapperConfig.java  -1
+ cloudnet-lib/src/main/java/eu/cloudnetservice/cloudnet/v2/lib/process/ProxyProcessData.java  -1
         

See the complete overview on Codacy