patch 8.0.0730: terminal feature only supports Unix-like systems

Problem:    Terminal feature only supports Unix-like systems.
Solution:   Prepare for adding an MS-Windows implementaiton.

patch 8.0.0729: the help for the terminal configure option is wrong

Problem:    The help for the terminal configure option is wrong.
Solution:   Change "Disable" to "Enable". (E Kawashima, closes vim#1849)
            Improve alignment.

patch 8.0.0728: the terminal structure is never freed

Problem:    The terminal structure is never freed.
Solution:   Free the structure and unreference what it contains.

patch 8.0.0727: message about what register to yank into is not trans…

…lated

Problem:    Message about what register to yank into is not translated.
            (LemonBoy)
Solution:   Add _().

patch 8.0.0726: translations cleanup script is too conservative

Problem:    Translations cleanup script is too conservative.
Solution:   Also delete untranslated messages.

patch 8.0.0725: a terminal window does not handle keyboard input

Problem:    A terminal window does not handle keyboard input.
Solution:   Add terminal_loop().  ":term bash -i" sort of works now.

patch 8.0.0724: the message for yanking doesn't indicate the register

Problem:    The message for yanking doesn't indicate the register.
Solution:   Show the register name in the "N lines yanked" message. (Lemonboy,
            closes vim#1803, closes vim#1809)

patch 8.0.0723: arglist test fails if file name case is ignored

Problem:    Arglist test fails if file name case is ignored.
Solution:   Wipe existing buffers, check for fname_case property.

patch 8.0.0722: screen is messed by timer up at inputlist() prompt

Problem:    Screen is messed by timer up at inputlist() prompt.
Solution:   Set state to ASKMORE. (closes vim#1843)

patch 8.0.0721: :argedit can only have one argument

Problem:    :argedit can only have one argument.
Solution:   Allow for multiple arguments. (Christian Brabandt)