Translator comments and meta-strings support for pyside-lupdate

As it currently stands, the tool pyside2-lupdate does not support translator comments or meta-data strings like its c++ counterpart does.

The c++ version supports the following according to the documentation :

A translator comment for adding extra information to a source string

//: This name refers to a host name.
hostNameLabel->setText(tr("Name:"));

Meta-data strings for assigning an ID to a source string

//= qtn_foo_bar 
QString text = MyMagicClass::tr("Sim sala bim.");

It would be nice to have a pyside counterpart to these types of comments.

For the translator comments:

#: This name refers to a host name. 
host_name_label.setText(self.tr("Name:"))

For the meta-data

#= qtn_foo_bar 
text = MyMagicClass.tr("Sim sala bim.");