fix autocompletions

[s-cork]

close #201

Approach:

• I wrote a script to do the replacement

before

  @anvil_prop
  def align(self, value):
    ...

  #!componentProp(m3.Button)!1: {name:"align",type:"enum",options:["left", "right", "center"],description:"The position of this component in the available space."}

after

  @anvil_prop
  @property
  def align(self, value) -> str:
    """The position of this component in the available space."""
    ...

  #!componentProp(m3.Button)!1: {name:"align",type:"enum",options:["left", "right", "center"],description:"The position of this component in the available space."}

• I checked the autocompletions worked
• I checked for the code still loaded by doing import m3.components as m3 in a client repl

---

Worth checking the change to _utils.properties
We only use anvil_prop as a decorator now

before

  show_label = anvil_prop("show_label")

after

  show_label = simple_prop("show_label")

This seems to be enough for the autocompleter to work as expected
while maintaining the existing helpers