Refactor source layout

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

[no changelog]

src/main/kotlin/util/render/TranslatedScissors.kt

@@ -0,0 +1,22 @@
+
+package moe.nea.firmament.util.render
+
+import org.joml.Vector4f
+import net.minecraft.client.gui.DrawContext
+
+fun DrawContext.enableScissorWithTranslation(x1: Float, y1: Float, x2: Float, y2: Float) {
+    val pMat = matrices.peek().positionMatrix
+    val target = Vector4f()
+
+    target.set(x1, y1, 0f, 1f)
+    target.mul(pMat)
+    val scissorX1 = target.x
+    val scissorY1 = target.y
+
+    target.set(x2, y2, 0f, 1f)
+    target.mul(pMat)
+    val scissorX2 = target.x
+    val scissorY2 = target.y
+
+    enableScissor(scissorX1.toInt(), scissorY1.toInt(), scissorX2.toInt(), scissorY2.toInt())
+}