possible fix for #72
try to fix autoscroll on win7  #72

http://wiki.wxwidgets.org/WxTextCtrl#Scrolling
"ScrollLines will ensure the scroll bar is at the real end of the range, not further."
use wupdlock instead of freeze/thaw, remove comment
remove refresh, as it shouldn't be necessary
scroll more lines to observer effect on win7
remove double include, scroll lines first, then show last position
do nothing if autoscroll is disabled on msw, change some comments
reformat file, since i have already touched it
re enable chat options button, break some long lines

was disabled in
e48ab34b88717fe76fcbd798db611fd055ebdd1c
Merge pull request #81 from baracoder/autoscroll_possible_fix

Fix MSW autoscroll, cleanup, enable options button