made assets work independently from the working dir

assets.py

@@ -1,12 +1,18 @@
+import os.path
 from PyQt5.QtGui import QIcon, QPixmap
 
 
+def get_asset(name):
+    dname = os.path.dirname(__file__)
+    return os.path.join(dname, "assets", name)
+
+
 # These are function in order not to trigger:
 # Must construct a QGuiApplication before a QPixmap
 
-logo = lambda: QPixmap("assets/logo.png")
-icon = lambda: QIcon("assets/icon.png")
-char = lambda: QIcon("assets/char.png")
+logo = lambda: QPixmap(get_asset("logo.png"))
+icon = lambda: QIcon(get_asset("icon.png"))
+char = lambda: QIcon(get_asset("char.png"))