Backlight dimmer

Backlight dimmer option
Signed-off-by: flar2
<asegaert@gmail.com>
https://github.com/flar2/flo/commit/3ae0b849cef2deb9b71d2a8eb831668f7fb71b42

backlight_dimmer:
a bit less dim and disable by default
Signed-off-by: flar2
<asegaert@gmail.com>
https://github.com/flar2/flo/commit/8569a624d613d658845d654df732826b3afefa4b

adjustable
brightness
Signed-off-by: flar2
<asegaert@gmail.com>
https://github.com/flar2/flo/commit/1642bd75954ab7ee08ee46da1e9613a77f16a7ec

fix
typos
Signed-off-by: flar2
<asegaert@gmail.com>
https://github.com/flar2/flo/commit/3e02ebbe72c533d421a9286844120979333ddbdf

disable
by default
Signed-off-by: flar2
<asegaert@gmail.com>
https://github.com/flar2/flo/commit/62d215fbd3fdf7ab5a1944e975ecfe9a61cb88c7