Create icons for and implement right-angle rotation buttons.

src/mcedit2/assets_raw/icons.svg

@@ -16,7 +16,7 @@
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+   inkscape:export-filename="..\assets\mcedit2\icons\right_angle.png"
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@@ -2270,7 +2270,8 @@
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+           style="color:#000000;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;fill:#000000;fill-opacity:0;fill-rule:nonzero;stroke:#65c035;stroke-width:7.83833504;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:9.89999962;stroke-opacity:1;marker:none;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate"
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+       inkscape:groupmode="layer"
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+         y="63.80043" />
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src/mcedit2/editortools/move.py

@@ -12,6 +12,7 @@ from mcedit2.command import SimpleRevisionCommand
 from mcedit2.imports import PendingImportNode, PendingImport
 from mcedit2.rendering.scenegraph import scenenode
 from mcedit2.util.load_ui import load_ui
+from mcedit2.util.resources import resourcePath
 from mcedit2.util.showprogress import showProgress
 from mcedit2.widgets.coord_widget import CoordinateWidget
 from mcedit2.widgets.layout import Column
@@ -112,8 +113,38 @@ class RotationWidget(QtGui.QWidget):
         self.yRotSpinBox.valueChanged.connect(self.setYRot)
         self.zRotSpinBox.valueChanged.connect(self.setZRot)
 
+        icon = QtGui.QIcon(resourcePath("mcedit2/assets/mcedit2/icons/right_angle.png"))
+        self.xRot90Button.setIcon(icon)
+        self.yRot90Button.setIcon(icon)
+        self.zRot90Button.setIcon(icon)
+
+        self.xRot90Button.clicked.connect(self.xRot90Clicked)
+        self.yRot90Button.clicked.connect(self.yRot90Clicked)
+        self.zRot90Button.clicked.connect(self.zRot90Clicked)
+
         self.xRot = self.yRot = self.zRot = 0
 
+    def rot90(self, angle):
+        if angle < 90:
+            angle = 90
+        elif angle < 180:
+            angle = 180
+        elif angle < 270:
+            angle = 270
+        else:
+            angle = 0
+
+        return angle
+
+    def xRot90Clicked(self):
+        self.setXRot(self.rot90(self.xRot))
+
+    def yRot90Clicked(self):
+        self.setYRot(self.rot90(self.yRot))
+
+    def zRot90Clicked(self):
+        self.setZRot(self.rot90(self.zRot))
+
     rotationChanged = QtCore.Signal(object, bool)
 
     @property