Loaders snaps, works and utils

Provide smart auto-snap feature of loaders to belt entities : \- Snap on placement and rotation \- Snap with belts, underground belts, splitter and other loaders \- Detect ambiguous state where input and output belt can connected to the loader at the same time \- Snap is locked if state unambiguous \- Snap will display vanilla alerts if you're can't change loaders \- Manual toggling is possible if two loaders face each other \- Manual toggling is possible if state is ambiguous Provide compatibility options with other mods : \- Provide setting to select snapping algorithm from various mods \- Provide setting to select working (pushing and pulling from inventories) algorithm from various mods