Update relation of shadowing

I created a relation one to one for shadowing but here I'm updating it to be a one to many relation.

It is possible that a single entity gets shadowed multiple times. Example in python:

```python
def function_with_local_of_same_name(init):
    if init > 10:
        return init


    function_with_local_of_same_name = init
    #function_with_local_of_same_name = function_with_local_of_same_name(1)
    return function_with_local_of_same_name + 3


print(function_with_local_of_same_name(0))

def function_with_local_of_same_name(init):
    return init
```

The function get shadowed once by a temporary and a second time by an other function

src/Famix-MetamodelGeneration/FamixGenerator.class.st

@@ -1645,9 +1645,9 @@ FamixGenerator >> defineRelations [
 	((tParametricEntity property: #genericization)
 			comment: 'Generic entity relationship, i.e. the association to the generic entity of this type.').
 
-	((tShadowable property: #shadowingEntity)
-		comment: 'Entity shadowing me in my defining scope.')
-		-
+	((tShadowable property: #shadowingEntities)
+		comment: 'Entities shadowing me in my defining scope.')
+		-*
 	((tShadower property: #shadowedEntity)
 		comment: 'Entity that is been shadowed by myself in my defining scope.')
 ]

src/Famix-Traits/FamixTShadowable.trait.st

@@ -30,15 +30,15 @@ The opposite of a shadowable is a shadower.
 ### Other
 | Relation | Origin | Opposite | Type | Comment |
 |---|
-| `shadowingEntity` | `FamixTShadowable` | `shadowedEntity` | `FamixTShadower` | Entity shadowing me in my defining scope.|
+| `shadowingEntities` | `FamixTShadowable` | `shadowedEntity` | `FamixTShadower` | Entities shadowing me in my defining scope.|
 
 
 
 "
 Trait {
 	#name : #FamixTShadowable,
 	#instVars : [
-		'#shadowingEntity => FMOne type: #FamixTShadower opposite: #shadowedEntity'
+		'#shadowingEntities => FMMany type: #FamixTShadower opposite: #shadowedEntity'
 	],
 	#category : #'Famix-Traits-Traits'
 }
@@ -52,6 +52,12 @@ FamixTShadowable classSide >> annotation [
 	^ self
 ]
 
+{ #category : #adding }
+FamixTShadowable >> addShadowingEntity: anObject [
+	<generated>
+	^ self shadowingEntities add: anObject
+]
+
 { #category : #testing }
 FamixTShadowable >> isShadowable [
 
@@ -66,17 +72,18 @@ FamixTShadowable >> isShadowed [
 ]
 
 { #category : #accessing }
-FamixTShadowable >> shadowingEntity [
-	"Relation named: #shadowingEntity type: #FamixTShadower opposite: #shadowedEntity"
+FamixTShadowable >> shadowingEntities [
+	"Relation named: #shadowingEntities type: #FamixTShadower opposite: #shadowedEntity"
 
 	<generated>
-	<FMComment: 'Entity shadowing me in my defining scope.'>
-	^ shadowingEntity
+	<FMComment: 'Entities shadowing me in my defining scope.'>
+	<derived>
+	^ shadowingEntities
 ]
 
 { #category : #accessing }
-FamixTShadowable >> shadowingEntity: anObject [
+FamixTShadowable >> shadowingEntities: anObject [
 
 	<generated>
-	shadowingEntity := anObject
+	shadowingEntities value: anObject
 ]

src/Famix-Traits/FamixTShadower.trait.st

@@ -30,15 +30,15 @@ The opposite of a shadower is a shadowable.
 ### Other
 | Relation | Origin | Opposite | Type | Comment |
 |---|
-| `shadowedEntity` | `FamixTShadower` | `shadowingEntity` | `FamixTShadowable` | Entity that is been shadowed by myself in my defining scope.|
+| `shadowedEntity` | `FamixTShadower` | `shadowingEntities` | `FamixTShadowable` | Entity that is been shadowed by myself in my defining scope.|
 
 
 
 "
 Trait {
 	#name : #FamixTShadower,
 	#instVars : [
-		'#shadowedEntity => FMOne type: #FamixTShadowable opposite: #shadowingEntity'
+		'#shadowedEntity => FMOne type: #FamixTShadowable opposite: #shadowingEntities'
 	],
 	#category : #'Famix-Traits-Traits'
 }
@@ -54,11 +54,10 @@ FamixTShadower classSide >> annotation [
 
 { #category : #accessing }
 FamixTShadower >> shadowedEntity [
-	"Relation named: #shadowedEntity type: #FamixTShadowable opposite: #shadowingEntity"
+	"Relation named: #shadowedEntity type: #FamixTShadowable opposite: #shadowingEntities"
 
 	<generated>
 	<FMComment: 'Entity that is been shadowed by myself in my defining scope.'>
-	<derived>
 	^ shadowedEntity
 ]