Parser, Remove tabs before check empty lines

[theludovyc]

If you are in this case

menu menu_test:
  "Test option 1" > test_option_1
  "Test option 2"
  "Test option 3" > test_option_3
 <= tab here
test_option_1:

You gonna have this error
Parser: Error on line: X, it is not a choice !

This happen because parser check empty line before remove tabulations

[theludovyc]

I was thinking to remove all spaces or tabs at begin of a line. So user can indent with spaces or tabs.
Choices for now are only things check indent level to go out from menu state. Maybe I have a solution to no do that, I need to do a test.

Finaly, the user can indent his code like he want.

What do you think about it ? @Jeremi360

[Jeremi360]

@theludovyc If the new solution does not spoil compatibility with the current RakuScript syntax,
then yes change it.

[theludovyc]

Okay, I will do it in #220