Better logging of duplicate files in resourcepack generation

[LoneDev6]

Currently ItemAdder cuts the first part of the path in the warning errors.
This is a bad behaviour because some resourcepack files might have been found in other plugins folders and cause confusion.
The new logging will show the complete path instead.

Example of the new logging for shaders overlapping text effects and emotes:

Found shader overlapping an ItemsAdder Texts shader: plugins/BetterHud/build/assets/minecraft/shaders/core/rendertype_text.json -> shaders/core/rendertype_text.json
Disable text-effects to edit these shaders manually.
[Pack] pre-1.21.2 shader JSON found. Adding 1.21.2+ compatibility. File: plugins/BetterHud/build/assets/minecraft/shaders/core/rendertype_entity_translucent_cull.json
[Pack] pre-1.21.2 shader JSON found. Adding 1.21.2+ compatibility. File: plugins/BetterHud/build/assets/minecraft/shaders/core/rendertype_item_entity_translucent_cull.json
[Pack] pre-1.21.2 shader JSON found. Adding 1.21.2+ compatibility. File: plugins/BetterHud/build/assets/minecraft/shaders/core/rendertype_entity_cutout.json

I also implemented a log to clearly show where the duplicate any duplicate file was found.

Example of the new logging for duplicate files:

Duplicate found. contents/dupl2/resourcepack/minecraft/textures/item/modern_quartz.png -> textures/item/modern_quartz.png
Previous file: contents/dupl1/resourcepack/minecraft/textures/item/modern_quartz.png

[LoneDev6]

This will help both staff members, me and the customers to get more info about where is the cause of duplicate files issues, which wasn't that easy to find previously.