feat(chat): add message deletion

[Silthus]

Closes #12

[codecov]

Codecov Report

Merging #42 (bbca5a5) into beta (aaa1b10) will increase coverage by 0.39%.
The diff coverage is 95.91%.

@@             Coverage Diff              @@
##               beta      #42      +/-   ##
============================================
+ Coverage     81.32%   81.71%   +0.39%     
- Complexity      460      483      +23     
============================================
  Files            55       56       +1     
  Lines          1499     1537      +38     
  Branches        118      119       +1     
============================================
+ Hits           1219     1256      +37     
- Misses          191      193       +2     
+ Partials         89       88       -1     

Impacted Files	Coverage Δ
src/main/java/net/silthus/chat/ChatTarget.java	100.00% <ø> (ø)
src/main/java/net/silthus/chat/Constants.java	64.28% <ø> (ø)
.../main/java/net/silthus/chat/scopes/LocalScope.java	100.00% <ø> (ø)
...main/java/net/silthus/chat/scopes/ServerScope.java	100.00% <ø> (ø)
.../main/java/net/silthus/chat/scopes/WorldScope.java	100.00% <ø> (ø)
src/main/java/net/silthus/chat/SChat.java	61.14% <50.00%> (ø)
src/main/java/net/silthus/chat/Scopes.java	85.00% <75.00%> (-1.49%)	⬇️
src/main/java/net/silthus/chat/Message.java	78.20% <100.00%> (+0.57%)	⬆️
src/main/java/net/silthus/chat/Scope.java	100.00% <100.00%> (ø)
...lthus/chat/conversations/AbstractConversation.java	88.46% <100.00%> (+2.09%)	⬆️
... and 9 more

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🎉 This PR is included in version 1.0.0 🎉

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