Attributes with blankspaces lead to syntax error or unexpected generated code

[mgv99]

Describe the bug

We are "allowed" to use blankspaces in attribute names, but when generating python classes, it only keeps the first word. For instance, an attribute called "task name: str" would generate an attribute:

self.task = task

Expected behaviour: create an attr called:
task_name: str

To fix it: replace blankspaces by underscores?

With Enum classes, the behaviour is different: it keeps all the words but syntax is still incorrect (spaces should be replaced by underscores):

class TaskStatus(Enum):
	Not started = "Not started"
	
	Done = "Done"
	
	In Progress = "In Progress"

If blankspaces are not allowed, there should be some compilation error, or at least some warning.

[jcabot]

We're adding a rule in BUML to raise an exception if an attribute name has a blank space as, like in this case, this generates many issues that are not worth dealing with just for the very few cases where a user would like to have a blank space in the name of an attribute