Make type annotation optional for self argument of class methods

[EmilyBourne]

Describe the feature

According to PEP 484 we shouldn't need to annotate the first argument of a class method. We should make this annotation optional.

Test Code

Provide code which does not currently work but which should do when this issue is fixed:

class MyClass:
    def __init__(self, param1 : 'float[:]'):
        self.param1 = param1
        print("MyClass Object created!")
        print(self.param1)

Proposed Solution

The annotation should be added in the syntactic stage if it is not already present