segaufo layout file placeholder
Merge pull request #24 from 0-wiz-0/master

Convert to UTF-8.
twin16: according to schems this is priority related, not a flip bit (nw)
ignore inp directory (nw)
ufomini works
New Arkanoid Returns clone

New Clone Added
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Arkanoid Returns (Ver 2.02A 1997/02/10) [Bill D, The Dumping Union]
(MESS) x820ii: Added notes and BIOS revisions. (nw)
ufo21 works
Fix for incorrectly listed crc in ec1841.xml (nw)
new clones
Botanic (English / Spanish) [Arcade Vintage ((http://arcadevintageshop.blogspot.com.es/ ), Ricky2001]
new clones
Galaxy Monsters (Laguna S.A. Spanish bootleg of Space Invaders) [Arcade Vintage ( http://arcadevintageshop.blogspot.com.es/ ), Ricky2001]
new clones
Donkey Kong (Spanish Crazy Kong bootleg) [Marcos75 (from AUMAP)]
new clones
JT-104 [??]

seems to be a cheap hack (just a gfx rom change) but some sources say it's official.  There's a possibility the board should have been using different program roms to the ones that were on it.
upd7810: Fixed ADC output register range.
upd7810: ADC functions should return bytes.
upd7810: sample and hold ADC value at start of conversion process.
upd7810: clear sample and hold on ADC reset
upd7810: remove code duplication in timers 0 and 1
upd7810: remove code duplication in ETIMER
upd7810: set ETIMER interrupts