Update and reorganise themes (#893)

* Drop the subfolders for GUI themes
* Remove bundled font support
* Add safe file read function
* Allow loading themes from multiple locations
* Clean up unused variables
* Clean up icons class
* Merge icon theme icons
* Update icon theme class
* Remove guiDark config setting
* Fix tests
* Fix handling of default theme
* Update icon readmes
* Add test for getGuiItem common function

tests/tools.py

@@ -25,7 +25,7 @@ import shutil
 from PyQt5.QtWidgets import qApp
 
 
-def cmpFiles(fileOne, fileTwo, ignoreLines=None):
+def cmpFiles(fileOne, fileTwo, ignoreLines=None, ignoreStart=None):
     """Compare two files, but optionally ignore lines given by a list.
     """
     if ignoreLines is None:
@@ -59,6 +59,11 @@ def cmpFiles(fileOne, fileTwo, ignoreLines=None):
             print("Ignoring line %d" % (n+1))
             continue
 
+        if ignoreStart is not None:
+            if lnOne.startswith(ignoreStart):
+                print("Ignoring line %d" % (n+1))
+                continue
+
         if lnOne != lnTwo:
             print("Diff on line %d:" % (n+1))
             print(" << '%s'" % lnOne)