Remove TConstruct slot support from grave auto-equip when tab is disabled

[Eldrinn-Elantey]

Depends on #48 and GTNewHorizons/TinkersConstruct#279.

TConstruct slot handling is kept but skipped when PHConstruct.enableTinkerInventoryTab is false. This prevents items from being silently placed into hidden non-functional slots when the tab is disabled, while still working correctly in modpacks that keep it enabled.

[koolkrafter5]

Rather than completely removing this, could you just check for the config to disable the tinker tab? That way it will be useful in other modpacks that want to keep the tab.

[tiffit]

There are a few places where Class.forName is regularly called to check if a class exists. These can probably be checked once and cached

[danyadev]

It's better to implement something like this using Loader.isModLoaded:
https://github.com/GTNewHorizons/Backhand/blob/master/src/main/java/xonin/backhand/utils/Mods.java

[Eldrinn-Elantey]

Done, switched to Loader.isModLoaded

[danyadev]

enableTinkerInventoryTab is a new config field which is not available in previous TConstruct versions, so i'd suggest catching a potential java error when accessing it, with a comment about it being available only since 1.14.72-GTNH

[Eldrinn-Elantey]

Done, added try-catch for NoSuchFieldError with fallback to true for older TConstruct versions