Jubilee Double-Up Poker (TMS9980) updates... [Roberto Fresca]

 - Corrected the crystal value and derivate clocks via #DEFINE.
 - Improved memory map.
 - Hooked the CRT controller, but the init sequence seems incomplete.
 - Created the accurate graphics banks.
 - Found and mapped the video RAM.
 - Hooked the ATTR RAM.
 - Assigned the correct graphics banks to the proper drawn tiles.
 - Find and mapped an input port.
 - Started a preliminary workaround to demux the input port.
 - Added technical notes.