* Allow plugins to use PSR-4 namespace mapping
this is a reduced implementation which serves the 99% use case without being horribly breakable.
Plugins may now specify a `src-namespace-prefix`, which should be set to the namespace of the classes in `src`.
If the old system is used, `src-namespace-prefix` can be omitted, or set to an empty string.
Examples:
- If `src-namespace-prefix` is `dktapps\test`, `dktapps\test\Main` will be searched for in `src/Main.php`, instead of `src/dktapps/test/Main.php`.
* Migrate TesterPlugin to PSR-4
The motivation for this is to prevent passing a dynamic argument to cancellation, which in almost all cases is a bug in user code. This same mistake also appears in a few places in the PM core (as seen in this commit), but in those cases the mistakes were mostly harmless since they were taking place before the event was actually called.
closes#3836
This parameter is not used for the vast majority of task use cases and just serves as extra useless boilerplate code, especially for closure-based tasks.
This use case can be replaced using Server->getTick() in the cases where it matters.
This is now self-maintaining and doesn't rely on the async pool to wipe its ass on task completion. Instead, the garbage collector will cause thread-local data to be automatically released when the async task is garbage-collected on the main thread.
This brings two plugin-breaking changes: AsyncTask->onCompletion() and AsyncTask->onProgressUpdate() no longer accept Server parameters.
This now allows for the functionality of AsyncPool and AsyncTask to be tested outside of a Server.
I am eating my own words this once, because having the tester plugin as a separate repository makes no sense - it is just added barriers to writing proper tests with no actual benefit. Since the tester plugin is specifically intended for CI, it doesn't make sense for it to be in its own module.
