config: Bring back support for legacy config with a warning

test/limine.conf

@@ -0,0 +1,58 @@
+# Some example macros
+${TEST_KERNEL}=boot():/boot/test.elf
+${WALLPAPER_PATH}=boot():/boot/bg.jpg
+
+default_entry: 1
+timeout: 3
+verbose: yes
+
+# Terminal related settings
+term_wallpaper: ${WALLPAPER_PATH}
+term_backdrop: 008080
+
+/Limine Test
+    comment: Test of the Limine boot protocol. ${ARCH}
+
+    protocol: limine
+    kernel_path: ${TEST_KERNEL}
+    kernel_cmdline: This is an example kernel command line.
+
+    module_path: ${WALLPAPER_PATH}
+    module_cmdline: This is the first module.
+
+    module_path: boot():/boot/bg.jpg
+
+/Multiboot2 Test
+    comment: Test of the multiboot2 boot protocol.
+
+    protocol: multiboot2
+    kernel_path: boot():/boot/multiboot2.elf
+    kernel_cmdline: This is an example kernel command line.
+
+    module_path: boot():/boot/bg.jpg
+    module_string: This is the first module.
+
+/EFI Chainloading
+    comment: Test EFI image chainloading.
+
+    protocol: efi_chainload
+    image_path: boot():/EFI/BOOT/BOOTX64.EFI
+
+/BIOS Chainloading
+    comment: Test BIOS chainloading.
+
+    protocol: bios_chainload
+    drive: 1
+
+/+Legacy
+    comment: Directory containing legacy entries.
+
+    //Multiboot1 Test
+        comment: Test of the multiboot1 boot protocol.
+
+        protocol: multiboot1
+        kernel_path: boot():/boot/multiboot.elf
+        kernel_cmdline: This is an example kernel command line.
+
+        module_path: boot():/boot/bg.jpg
+        module_string: This is the first module.