Add scalable OpenSans font test GUI and /kamkeel testfont command

src/main/java/kamkeel/npcs/client/gui/GuiFontTest.java

@@ -0,0 +1,47 @@
+package kamkeel.npcs.client.gui;
+
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+import kamkeel.npcs.client.renderer.font.ScalableSdfFontRenderer;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.ScaledResolution;
+
+@SideOnly(Side.CLIENT)
+public class GuiFontTest extends GuiScreen {
+    private static final int[] SAMPLE_SIZES = new int[]{8, 12, 16, 24, 32, 48, 64};
+    private static final String SAMPLE_TEXT = "The quick brown fox jumps over 1234567890";
+
+    @Override
+    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
+        this.drawDefaultBackground();
+
+        ScalableSdfFontRenderer renderer = ScalableSdfFontRenderer.INSTANCE;
+        renderer.ensureInitialized();
+
+        int left = 24;
+        int y = 20;
+        renderer.drawString("GuiFontTest - OpenSans.ttf scaling demo", left, y, 20, 0xFFFFFFFF);
+        y += 28;
+
+        for (int size : SAMPLE_SIZES) {
+            int baseline = y + renderer.getLineHeight(size) - 4;
+            drawHorizontalLine(left - 6, this.width - 24, baseline, 0x66FFFFFF);
+            renderer.drawString(size + "px | " + SAMPLE_TEXT, left, y, size, 0xFFFFFFFF);
+            y += renderer.getLineHeight(size) + 10;
+        }
+
+        ScaledResolution scaled = new ScaledResolution(this.mc, this.mc.displayWidth, this.mc.displayHeight);
+        int debugY = this.height - 58;
+        renderer.drawString("Renderer: " + renderer.getRendererPath(), left, debugY, 12, 0xFF88FF88);
+        renderer.drawString("Atlas: " + renderer.getAtlasDimensions() + " | guiScale=" + this.mc.gameSettings.guiScale + " | scaleFactor=" + scaled.getScaleFactor(), left, debugY + 14, 12, 0xFF88FF88);
+        renderer.drawString("ESC to close", left, debugY + 28, 12, 0xFFBBBBBB);
+
+        super.drawScreen(mouseX, mouseY, partialTicks);
+    }
+
+    @Override
+    public boolean doesGuiPauseGame() {
+        return false;
+    }
+}