api changes:
- removed cooldown methods from CustomStack, they were useless and unreliable

fixes:
- fixed some CustomStack API methods editing the base item instead of the instantiated item stack
- fixed blocks interaction compatibility with EpicBackpacks and potentially other plugins https://github.com/PluginBugs/Issues-ItemsAdder/issues/1977
- fixed CustomEntity do no appear instantly after being spawned https://github.com/PluginBugs/Issues-ItemsAdder/issues/1989
- fixed entities little memory leak when reloading via Plugman and similar
- fixed monsters on fire if plugin reloaded
- fixed kick "Illegal characters in chat" https://github.com/PluginBugs/Issues-ItemsAdder/issues/1975
- performance optimizations