If a user sets VideoCards to 'false', most likely they don't want a
gui and have selected the improper option. Rather than reaching the
DESKTOP() function and letting emerge error out, prompt the user to
either set VideoCards to allow xorg-drivers to be installed or don't
attempt to install a desktop.

This helps to normalize the cursor

Added 'srandr.sh' which can utilize a local '~/.display.sh' to read
values as shown in the following:

DisplayConfigs="LVDS1 HDMI1 VGA1"
LVDS1() {
    xrandr --output LVDS1 --auto
}
HDMI1() {
    xrandr --output HDMI1 --auto --above LVDS1
}
VGA1() {
    xrandr --output VGA1  --auto --above LVDS1
}

Haven't had any issues with -O3 thus far, though changing to -O2 should (slightly) reduce overall resource consumption

- Improve style/formatting; remove trailing '&&' and replace tabs with spaces
- Remove LAPTOP() and make it a post-DESKTOP() prompt
- Don't attempt to auto-set the root password, prompt for the password in POSTINSTALL()