Split the screen element objects out into a set of outer classes. (dm)


git-svn-id: svn://mielke.cc/main/brltty@6885 91a5dbb7-01b9-0310-9b5f-b28072856b6e
The RealScreenElement constructor on Android caused a null pointer exception. (dm)


git-svn-id: svn://mielke.cc/main/brltty@6886 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Split out the actual braille rendering into a separate object. (dm)


git-svn-id: svn://mielke.cc/main/brltty@6887 91a5dbb7-01b9-0310-9b5f-b28072856b6e