Add the beginnings of a cura theme

styles.qml

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+import QtQuick 2.1
+import QtQuick.Controls 1.1
+import QtQuick.Controls.Styles 1.1
+
+QtObject {
+    
+}

theme.json

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+{
+    "fonts": {
+        "large": {
+            "size": 1.5,
+            "bold": true
+        },
+        "default": {
+            "size": 1
+        },
+        "small": {
+            "size": 0.8
+        },
+        "tiny": {
+            "size": 0.5
+        }
+    },
+
+    "colors": {
+        "primary": [1.0, 0.0, 0.0, 1.0],
+        "border": [0.0, 1.0, 0.0, 1.0]
+    },
+
+    "sizes": {
+        "toolbar_button": [2.0, 2.0],
+        "window_margin": [1.0, 1.0],
+        "default_margin": [1.0, 1.0],
+        "panel": [10.0, 10.0],
+        "toolbar_spacing": [1.0, 1.0]
+    }
+}