Color Functions
void d3tui_set_foreground(d3tui_terminal_t* term, d3tui_color_t color);
void d3tui_set_background(d3tui_terminal_t* term, d3tui_color_t color);
void d3tui_set_colors(d3tui_terminal_t* term, d3tui_color_t fg, d3tui_color_t bg);
void d3tui_reset_colors(d3tui_terminal_t* term);Set foreground and background colors. Colors persist until changed.