[Feature request] Allow setting cursor and cursor text colors

There currently is no setting at all for setting the colors of the cursor and of cursor text.
This should be easy to implement as libvte exposes these:

vte_terminal_set_color_cursor
vte_terminal_set_color_cursor_foreground

I would kindly suggest adding these 2 settings, Currently, all LXTerminal does is to invert the text.