Fix bug with /audit unable to retrieve users #527
                
     Merged
            
            
          
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Overview
The latest rework of
/auditmessed up some stuff and had a few bugs. This fixes it, closes #522 .Details
The most prominent issue was incorrect usage of JDAs actions:
jda.retrieveUserById(id).complete()which blocked the JDA thread andjda.getUserById(id)which looked up (outdated) cache, failing to find the user.The issue has been fixed by properly using
RestActions and theirmap/flatMapchains. Obviously this uglifies the code a bit - but many new helper methods to the rescue.Apart from that, there have been some minor improvements on the UX:
As well as a few code readability improvements here and there, and some minor safety bugfixes like
page <= 1,page >= totalPagesinstead of==checks.Last, the methods have been re-ordered in time they are used to increase the readability flow - unfortunately that makes the review a bit nasty due to bad GitHub diffing.
Tests
Improvements are well tested, all edge cases included:
User totally unknown to the guild (= user with no actions):

User with one page actions

User with many pages actions (max page size was reduced to 3 for the test)
