No need to check if ! isset

If it’s empty, that will catch islet as well.
Whitespace!
Test for specific button press before inserting
Format the password output to be more readable
Don't return null, return what we got.

This is a filter, so we shouldn’t reject something that may be at a
higher filter priority than us.
Let's strip out all non-alphanumerics

This will let a user input their app password with spaces to make it
more readable, but still accept the result.
Whitespace and single vs double quotes.
Remove unneeded variable.

Also, indent array with spaces instead of tabs for neater alignment and
leave trailing comma in array.
Whitespaaaaaaace
Use braces.
Merge branch 'george' of github.com:georgestephanis/xmlrpc-application-password into georgestephanis-george

Conflicts:
	class.xap.php
Merge branch 'georgestephanis-george'