redid constructors and some other stuff in examples

this is preparation for ske implementation.

src/model/example/component_lexeme.py

@@ -1,7 +1,7 @@
 from model.data import Data
 
 class ComponentLexeme(Data):
-    def __init__(self, xml):
+    def __init__(self):
         self.other_attributes = {}
         self.text = ""
         self.role = ""