ENH: load stylesheet from file path rather than from string

 This makes it possible to use relative icon paths in QSS!

qtpyvcp/application.py

@@ -182,18 +182,16 @@ def loadStylesheet(self, stylesheet, watch=False):
         """
 
         def load(path):
-            with open(path, 'r') as fh:
-                self.setStyleSheet(fh.read())
+            LOG.info("Loading global stylesheet: yellow<{}>".format(stylesheet))
+            self.setStyleSheet("file:///" + path)
 
-        LOG.info("Loading QSS stylesheet file: yellow<{}>".format(stylesheet))
-        load(stylesheet)
+            if watch:
+                from qtpy.QtCore import QFileSystemWatcher
+                self.qss_file_watcher = QFileSystemWatcher()
+                self.qss_file_watcher.addPath(stylesheet)
+                self.qss_file_watcher.fileChanged.connect(load)
 
-        if watch:
-            LOG.info("In develop mode, changes to QSS file will automatically be applied")
-            from qtpy.QtCore import QFileSystemWatcher
-            self.qss_file_watcher = QFileSystemWatcher()
-            self.qss_file_watcher.addPath(stylesheet)
-            self.qss_file_watcher.fileChanged.connect(load)
+        load(stylesheet)
 
     def loadFont(self, font_path):
         """Loads a font file into the font database. The path can specify the

qtpyvcp/widgets/form_widgets/main_window.py

@@ -109,8 +109,7 @@ def loadStylesheet(self, stylesheet):
             stylesheet (str) : Path to a .qss stylesheet
         """
         LOG.info("Loading QSS stylesheet file: yellow<{}>".format(stylesheet))
-        with open(stylesheet, 'r') as fh:
-            self.setStyleSheet(fh.read())
+        self.setStyleSheet("file:///" + stylesheet)
 
     def getMenuAction(self, menu_action, title='notitle', action_name='noaction',
                       args=[], kwargs={}):