Bootscreen Hitachi

[AnHardt]

https://youtu.be/Mv327oQ7HqI
https://youtu.be/aGwt64Uy-Ms

Needed a bit of fun programming today. Inspired by #2541 (comment) i remembered that the Hitachi displays don't have a boot-screen.

There is not very much space on the small displays - so decided for scrolling and sequencing the strings.

Boot-screen for the character displays
When SHOW_BOOTSCREEN is on uses about additional 742 bytes of progmem and 32 bytes of RAM.
For that configurable.

Make boot-screen configurable for the graphic displays
When SHOW_BOOTSCREEN is off saves about 473 bytes of progmem and 28 bytes of RAM.

[thinkyhead]

Very nice. I really like the approximation of the logo. I see that marlinfirmware.o is all that will fit on 16-wide displays. Is that the only place it needs to scroll? If that's the case, maybe on tiny screens we can use ow.ly/QlYoI instead.

[eboston]

What about registering the domain name marlinfw.org? It's available. :)

[thinkyhead]

@eboston Totally. That's much nicer than ow.ly.

[AnHardt]

@thinkyhead
As configured now the URL is the only string that is too long.
But STRING_SPLASH_LINE1 and STRING_SPLASH_LINE2 are relativity easy user changeable - in the config.

If someone prefers to have SHOW_BOOTSCREEN disabled by default, i simply have to upload a ready commit.

[thinkyhead]

@AnHardt Should SHOW_BOOTSCREEN be extended to apply to the graphical display also?

[AnHardt]

@thinkyhead
SHOW_BOOTSCREEN for the full graphic displays is already in this PR. See: commit 2. https://github.com/AnHardt/Marlin_O/commit/daf8af958e6e7b89b46f5e4bbb06bb9c800ad27f
Sorry - that's not obvious because of some tab hunting, and shifting the delay.

[AnHardt]

Replaced by:
https://github.com/MarlinFirmware/MarlinDev/pull/13