Implements forced price refresh (resolves #196)

gui/builtinContextMenus/__init__.py

@@ -14,5 +14,6 @@ __all__ = [
     "whProjector",
     "cargo",
     "shipJump",
-    "targetResists"
+    "targetResists",
+    "priceClear"
 ]

gui/builtinContextMenus/priceClear.py

@@ -0,0 +1,22 @@
+from gui.contextMenu import ContextMenu
+import gui.mainFrame
+import wx
+import gui.globalEvents as GE
+import service
+
+class PriceClear(ContextMenu):
+    def __init__(self):
+        self.mainFrame = gui.mainFrame.MainFrame.getInstance()
+
+    def display(self, srcContext, selection):
+        return "priceViewFull" in srcContext
+
+    def getText(self, itmContext, selection):
+        return "Reset Price Cache"
+
+    def activate(self, fullContext, selection, i):
+        sMkt = service.Market.getInstance()
+        sMkt.clearPriceCache()
+        wx.PostEvent(self.mainFrame, GE.FitChanged(fitID=self.mainFrame.getActiveFit()))
+
+PriceClear.register()