Use icon theme so we can have more than one icon size per icon

resources/instances/instances.qrc

@@ -0,0 +1,30 @@
+<!DOCTYPE RCC>
+<RCC version="1.0">
+    <qresource prefix="/icons/instances">
+        <file alias="brick">brick.png</file>
+        <file alias="chicken">chicken128.png</file>
+        <file alias="creeper">creeper128.png</file>
+        <file alias="derp">derp.png</file>
+        <file alias="diamond">diamond.png</file>
+        <file alias="dirt">dirt.png</file>
+        <file alias="enderman">enderman.png</file>
+        <file alias="enderpearl">enderpearl128.png</file>
+        <file alias="ftb-glow">ftb_glow128.png</file>
+        <file alias="ftb-logo">ftb_logo128.png</file>
+        <file alias="gear">gear128.png</file>
+        <file alias="gold">gold.png</file>
+        <file alias="grass">grass.png</file>
+        <file alias="herobrine">herobrine128.png</file>
+        <file alias="infinity">infinity128.png</file>
+        <file alias="iron">iron.png</file>
+        <file alias="magitech">magitech128.png</file>
+        <file alias="meat">meat128.png</file>
+        <file alias="netherstar">netherstar128.png</file>
+        <file alias="planks">planks.png</file>
+        <file alias="skeleton">skeleton128.png</file>
+        <file alias="squarecreeper">squarecreeper128.png</file>
+        <file alias="steve">steve128.png</file>
+        <file alias="stone">stone.png</file>
+        <file alias="tnt">tnt.png</file>
+    </qresource>
+</RCC>