Deprecate the nu_scripts version of stdlib-candidate (#1042)

Deprecates the existing `stdlib-candidate` directories in `nu_scripts`
since `std-rfc` has now transitioned to the main repo. Updates readme
and renamed directories.

stdlib-candidate-archive/stdlib-candidate-older/std-rfc/nu_style.nu

@@ -0,0 +1,110 @@
+# This is a port of powershells $psstyle
+# found here https://github.com/PowerShell/PowerShell/blob/5f3dd938b792e1a395fd011ac1461246db7c0e1f/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
+
+# Example Usage
+# echo (fg_blue) Darren (relet) ' ' Schroeder | str collect
+# More examples in the short_list.nu script
+
+alias fmt_error = ansi -e '31;1m'
+alias fmt_warning = ansi -e '33;1m'
+alias fmt_verbose = ansi -e '33;1m'
+alias fmt_debug = ansi -e '33;1m'
+alias fmt_format_accent = ansi -e '32;1m'
+alias fmt_error_accent = ansi -e '36;1m'
+
+alias relet = ansi -e '0m' # really reset but there are external commands for reset already
+alias blink_off = ansi -e '25m'
+alias blink_on = ansi -e '5m'
+alias bold_off = ansi -e '22m'
+alias bold_on = ansi -e '1m'
+alias hidden_on = ansi -e '8m'
+alias hidden_off = ansi -e '28m'
+alias reverse_on = ansi -e '7m'
+alias reverse_off = ansi -e '27m'
+alias italic_off = ansi -e '23m'
+alias italic_on = ansi -e '3m'
+alias underline_off = ansi -e '24m'
+alias underline_on = ansi -e '4m'
+alias strikethrough_off = ansi -e '29m'
+alias strikethrough_on = ansi -e '9m'
+
+# this doesn't work right. i need to have an (ansi escape) defined but i don't think there is one
+#def format_hyperlink [link text] {echo [(ansi -o '8;;') $link '\' $text (ansi -o '8;;') '\'] | str collect }
+
+alias fg_black = ansi -e '30m'
+alias fg_red = ansi -e '31m'
+alias fg_green = ansi -e '32m'
+alias fg_yellow = ansi -e '33m'
+alias fg_blue = ansi -e '34m'
+alias fg_magenta = ansi -e '35m'
+alias fg_purple = ansi -e '35m'
+alias fg_cyan = ansi -e '36m'
+alias fg_white = ansi -e '37m'
+
+alias fg_dark_gray = ansi -e '90m'
+alias fg_light_black = ansi -e '90m'
+alias fg_light_red = ansi -e '91m'
+alias fg_light_green = ansi -e '92m'
+alias fg_light_yellow = ansi -e '93m'
+alias fg_light_blue = ansi -e '94m'
+alias fg_light_magenta = ansi -e '95m'
+alias fg_light_purple = ansi -e '95m'
+alias fg_light_cyan = ansi -e '96m'
+alias fg_light_gray = ansi -e '97m'
+alias fg_light_white = ansi -e '97m'
+
+# construct a rgb foreground color
+def fg_from_rgb [
+    red:int # red component 0-255
+    green:int # green component 0-255
+    blue:int # blue component 0-255
+    ] {
+        echo [(ansi -e '38;2;') $red ';' $green ';' $blue 'm'] | str join
+    }
+
+alias bg_black = ansi -e '40m'
+alias bg_red = ansi -e '41m'
+alias bg_green = ansi -e '42m'
+alias bg_yellow = ansi -e '43m'
+alias bg_blue = ansi -e '44m'
+alias bg_magenta = ansi -e '45m'
+alias bg_purple = ansi -e '45m'
+alias bg_cyan = ansi -e '46m'
+alias bg_white = ansi -e '47m'
+
+alias bg_dark_gray = ansi -e '100m'
+alias bg_light_black = ansi -e '100m'
+alias bg_light_red = ansi -e '101m'
+alias bg_light_green = ansi -e '102m'
+alias bg_light_yellow = ansi -e '103m'
+alias bg_light_magenta = ansi -e '105m'
+alias bg_light_purple = ansi -e '105m'
+alias bg_light_blue = ansi -e '104m'
+alias bg_light_cyan = ansi -e '106m'
+alias bg_light_gray = ansi -e '107m'
+alias bg_light_white = ansi -e '107m'
+
+alias bg_expand = ansi -e 'K'
+
+# construct a rgb background color
+def bg_from_rgb [
+    red:int # red component 0-255
+    green:int # green component 0-255
+    blue:int # blue component 0-255
+    ] {
+        $"(ansi -e '48;2;')($red);($green);($blue)m"
+    }
+
+# Get a foreground color from an index value 0-255
+def fg_from_index [
+    idx:int # index value 0-255
+] {
+    $"(ansi -e '38;5;')($idx)m"
+}
+
+# Get a background color from an index value 0-255
+def bg_from_index [
+    idx:int # index value 0-255
+] {
+    $"(ansi -e '48;5;')($idx)m"
+}