Hot reload memory leak

[geekrelief]

There's a small memory leak that occurs on hot reload. When reloading bullet.nim, memory increases by about 0.2MB when looking at the TaskManager on Windows. I don't know if this is happening inside Godot(GDNative initializing) or gdnim (Watcher). There doesn't seem to be any memory leak without hot reloading.

[geekrelief]

Looking at module/gdnative/nativescript/godot_nativescript.cpp, when something is registered it gets inserted into a Map. The insert method checks if the key already exists, and if so replaces the value. So reregistering on hot reload should have no leakage on the Godot side unless a class reloads with fewer properties, methods or signals.

This suggests there's a leak in gdnim. Probably with Watcher which might be related to #29 and general crashing in ARC/ORC.

[geekrelief]

The fix for ORC stability on reload didn't fix the memory leak. The size of the leak is dependent on how many nodes are reloaded.

[geekrelief]

The leak doesn't look like it's coming from Watcher based on what dumpInfo is showing. I can't rule out it's on gdnim's side.

At the minimum, the reload causes a 0.2MB leak, if I just change a float value and reload without instantiating anything new. In general usage this doesn't seem like a big deal, but it's something to be aware of.