fix: correct critical bugs in ScoreboardDatabaseManager and Stream cl… (#410)

* fix: correct critical bugs in ScoreboardDatabaseManager and Stream classes

- fix: clear() and rebuild()/rebuildAsync() using bare `scoreboard` instead of getScoreboard()
- fix: CustomDatabase spreading params correctly to super(...params)
- fix: inverted instanceof check in constructor type validation
- fix: inverted property-in-object checks across 4 Stream methods
- fix: loadAsync() now properly yields between iterations with await null

* chore: updated author info and add follow-up changes notes

Updated author and project links, added follow-up changes notes and warnings regarding legacy code.

Author: byKoro