Fix UTF8 issue on systems with another default encoding

[i0xHeX]

Fix for issue #142

[XenoAmess]

Hi.

Same issue in assemble.py also.

Think it can be fixed in this pr too.

My Drive
Index: assemble.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/assemble.py b/assemble.py
--- a/assemble.py	(revision 379f37795c127820c0212929dfdab449fb06c55e)
+++ b/assemble.py	(date 1633001555741)
@@ -13,8 +13,12 @@
 
 def assembleClass(filename):
     basename = os.path.basename(filename)
-    with open(filename, 'rU') as f:
-        source = f.read()
+    try:
+        with open(filename, 'rU') as f:
+            source = f.read()
+    except Exception:
+        with open(filename, 'rU', encoding='utf8') as f:
+            source = f.read()
     return assembleSource(source, basename)
 
 if __name__== "__main__":
Index: Krakatau/script_util.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/Krakatau/script_util.py b/Krakatau/script_util.py
--- a/Krakatau/script_util.py	(revision 379f37795c127820c0212929dfdab449fb06c55e)
+++ b/Krakatau/script_util.py	(date 1633001555757)
@@ -148,8 +148,12 @@
                 raise
 
         mode = 'wb' if isinstance(data, bytes) else 'w'
-        with open(out, mode) as f:
-            f.write(data)
+        try:
+            with open(out, mode) as f:
+                f.write(data)
+        except Exception:
+            with open(out, mode, encoding='utf8') as f:
+                f.write(data)
         return out
 
     def __enter__(self): return self