Refactor source layout

Introduce compat source sets and move all kotlin sources to the main directory

[no changelog]

src/main/kotlin/features/inventory/buttons/InventoryButtonTemplates.kt

@@ -0,0 +1,35 @@
+
+
+package moe.nea.firmament.features.inventory.buttons
+
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.encodeToString
+import net.minecraft.text.Text
+import moe.nea.firmament.Firmament
+import moe.nea.firmament.util.MC
+import moe.nea.firmament.util.TemplateUtil
+
+object InventoryButtonTemplates {
+
+    val legacyPrefix = "NEUBUTTONS/"
+    val modernPrefix = "MAYBEONEDAYIWILLHAVEMYOWNFORMAT"
+
+    fun loadTemplate(t: String): List<InventoryButton>? {
+        val buttons = TemplateUtil.maybeDecodeTemplate<List<String>>(legacyPrefix, t) ?: return null
+        return buttons.mapNotNull {
+            try {
+                Firmament.json.decodeFromString<InventoryButton>(it).also {
+                    if (it.icon?.startsWith("extra:") == true || it.command?.any { it.isLowerCase() } == true) {
+                        MC.sendChat(Text.translatable("firmament.inventory-buttons.import-failed"))
+                    }
+                }
+            } catch (e: Exception) {
+                null
+            }
+        }
+    }
+
+    fun saveTemplate(buttons: List<InventoryButton>): String {
+        return TemplateUtil.encodeTemplate(legacyPrefix, buttons.map { Firmament.json.encodeToString(it) })
+    }
+}