Convert the keyboard key table to support more than just key set 0. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7179 91a5dbb7-01b9-0310-9b5f-b28072856b6e
A few more Android keyboard key mappings. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7180 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Rename KBD_KEY_UNKNOWN to KBD_KEY_UNMAPPED. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7181 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Group the keyboard key name definitions better. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7182 91a5dbb7-01b9-0310-9b5f-b28072856b6e