Add OpenEXR export option

In preparation for depth map export.

src/main/java/com/replaymod/render/frame/EXRFrame.java

@@ -0,0 +1,34 @@
+package com.replaymod.render.frame;
+
+import com.replaymod.render.rendering.Frame;
+import de.johni0702.minecraft.gui.utils.lwjgl.ReadableDimension;
+import org.apache.commons.lang3.Validate;
+
+import java.nio.ByteBuffer;
+
+public class EXRFrame implements Frame {
+    private final int frameId;
+    private final ReadableDimension size;
+    private final ByteBuffer bgraBuffer;
+
+    public EXRFrame(int frameId, ReadableDimension size, ByteBuffer bgraBuffer) {
+        Validate.isTrue(size.getWidth() * size.getHeight() * 4 == bgraBuffer.remaining(),
+                "BGRA buffer size is %d (cap: %d) but should be %d",
+                bgraBuffer.remaining(), bgraBuffer.capacity(), size.getWidth() * size.getHeight() * 4);
+        this.frameId = frameId;
+        this.size = size;
+        this.bgraBuffer = bgraBuffer;
+    }
+
+    public int getFrameId() {
+        return this.frameId;
+    }
+
+    public ReadableDimension getSize() {
+        return this.size;
+    }
+
+    public ByteBuffer getBgraBuffer() {
+        return this.bgraBuffer;
+    }
+}