rendering. refactor. fix memory leak.
force bold. fix.
tscroll optimization
optimize rendering more.
refactor tscroll optimization.
move xmove.
fix tscroll optimization. remove comments.
only redraw window during scrollback if current term is focused.
space optimization, inline functions.
Revert "space optimization, inline functions."

This reverts commit 5826ce0622a110458f2292cab013a07fa5fa225d.
fix shift-tab in vim by implementing cursor pos report.
implement device attributes with > prefix.
return false DCS strings every time.