Remove rpg, ui, editor and scene subfolders; split scripts by platform

Delete src/dusk/rpg, src/dusk/ui, the animation/keyframe modules, the
scene subfolders, the chunk asset loader and ./editor, and strip the
dependent save slot, scene type, engine and test code so the main
binary and tests build again. Add scene/node.c/.h skeleton and move
build scripts into scripts/<platform>/.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

scripts/wii/build-wii-docker.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+docker build -t dusk-dolphin -f docker/dolphin/Dockerfile .
+docker run --rm -v "$(pwd):/workdir" dusk-dolphin /bin/bash -c "./scripts/wii/build-wii.sh"

scripts/wii/build-wii-iso-docker.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+docker build -t dusk-dolphin -f docker/dolphin/Dockerfile .
+docker run --rm -v "$(pwd):/workdir" dusk-dolphin /bin/bash -c "./scripts/wii/build-wii-iso.sh"

scripts/wii/build-wii-iso.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+if [ -z "$DEVKITPRO" ]; then
+  echo "DEVKITPRO environment variable is not set. Please set it to the path of your DEVKITPRO installation."
+  exit 1
+fi
+
+mkdir -p build-wii-iso
+cmake -S. -Bbuild-wii-iso \
+  -DDUSK_TARGET_SYSTEM=wii \
+  -DDUSK_DOLPHIN_BUILD_TYPE=ISO \
+  -DCMAKE_TOOLCHAIN_FILE="$DEVKITPRO/cmake/Wii.cmake"
+cd build-wii-iso
+make -j$(nproc) VERBOSE=1

scripts/wii/build-wii.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+if [ -z "$DEVKITPRO" ]; then
+  echo "DEVKITPRO environment variable is not set. Please set it to the path of your DEVKITPRO installation."
+  exit 1
+fi
+
+mkdir -p build-wii
+cmake -S. -Bbuild-wii \
+  -DDUSK_TARGET_SYSTEM=wii \
+  -DCMAKE_TOOLCHAIN_FILE="$DEVKITPRO/cmake/Wii.cmake" \
+  -DDUSK_DOLPHIN_BUILD_TYPE=DOL
+cd build-wii
+make -j$(nproc) VERBOSE=1
+mv Dusk.dol boot.dol