* bus/segaai: Rename device_segaai_card_interface to segaai_card_interface
* bus/segaai: Rename device_segaai_exp_interface to segaai_exp_interface
* hash/segaai.xml: Add barcode for several titles.
* hash/segaai.xml: Merge eigooha1 and eigooha2 into eigoohan, and eigogam1 and eigogam2 into eigogame.
* hash/segaai.xml: Update description for Eigo de Ohanashi and Eigo de Game.
* hash/segaai.xml: Add notes to Pinpon Music Rhythm and Melody.
* hash/segaai.xml: Merge Okeiko Aiueo and Hanamaru Aiueo into a single software item.
* hash/segaai.xml: Swapped checksums for Okeiko Aiueo and Hanamaru Aiueo and updated some notes.
* hash/segaai.xml: Added and replaced some overlays. Added placeholders for some older revisions released on cassette.
* hash/segaai.xml: Add cassette dumps of Alice World, Robinson Land, and Cosmis Train.
* hash/segaai.xml: Add dumps of several older cassette versions.
* hash/segaai.xml: Add/update serial, alt_title, and barcodes for cassette releases.
* hash/segaai.xml: Use improved overlay scans.
* layout/segaai.lay: Display clickable area when no overlay is present.
* layout/segaai.lay: Make cursor square.
* sega/segaai.cpp: Update old driver.
* sega/segaai.cpp: Let cards and expansions install themselves.
* sega/segaai.cpp: Adjust upd7759 sound level.
* sega/segaai.cpp: Mark cassette as stereo.
* sega/segaai.cpp: Only output the left channel from the cassette player.
* sega/segaai.cpp: Set the cassette channel to use for data input.
* sega/segaai.cpp: Add upd7759 busy signal to input port 4.
