Remove unimplemented color configuration

Will probably end up doing this differently anyway

config/aerc.conf

@@ -65,45 +65,3 @@ editor=
 subject,~^\[PATCH=contrib/hldiff.py
 text/html=contrib/html
 text/*=contrib/plaintext.py
-
-[colors]
-#
-# Colors are configured in one of two ways:
-#
-# "foreground" or "background:foreground"
-#
-# You can specify colors according to the base 8 names:
-# default, black, red, green, yellow, blue, magenta, cyan, white
-#
-# or you can use numbers for the 256 color palette,
-# e.g. "127:118" (a particularly ugly combination FYI)
-#
-# Add one or more of the following characters to the beginning
-# of the foreground color to add modifiers:
-#
-# * bold
-# _ underline
-# ^ reverse
-#
-# e.g. "default:_*^default" would reverse the default colors and
-# with bold and underlined modifiers
-borders=default:^default
-loading-indicator=default:default
-
-account-unselected=white:black
-account-selected=default:default
-account-error=red:black
-
-folder-unselected=default:default
-folder-selected=white:black
-
-status-line=white:black
-status-line-error=red:black
-
-ex-line=default:default
-
-message-list-selected=white:black
-message-list-selected-unread=white:_black
-message-list-unselected=default:default
-message-list-unselected-unread=default:*default
-message-list-empty=default:default

widgets/account.go

@@ -49,7 +49,7 @@ func NewAccountView(conf *config.AercConfig, acct *config.AccountConfig,
 	dirlist := NewDirectoryList(acct, logger, worker)
 	grid.AddChild(ui.NewBordered(dirlist, ui.BORDER_RIGHT))
 
-	msglist := NewMessageList(logger)
+	msglist := NewMessageList(conf, logger)
 	grid.AddChild(msglist).At(0, 1)
 
 	view := &AccountView{

widgets/msglist.go

@@ -23,9 +23,9 @@ type MessageList struct {
 	store    atomic.Value // *lib.MessageStore
 }
 
-// TODO: fish in config
-func NewMessageList(logger *log.Logger) *MessageList {
+func NewMessageList(conf *config.AercConfig, logger *log.Logger) *MessageList {
 	ml := &MessageList{
+		conf:     conf,
 		logger:   logger,
 		selected: 0,
 		spinner:  NewSpinner(),