parser/printer/tests: Add :redir parsing support
parser/printer/tests: Add various script commands parsing support
parser: Mark :mode as a command that accepts any string, including no
parser: Move parsing a sequence of files to a separate function
parser/tests: Add support for parsing :open
parser/tests: Add support for parsing :profdel
parser/tests: Record that :*select and :*jump are parsed with …_regex
parser/printer/tests: Add :[v]global command support
parser: Special commands do not require parsing functions