Patching thread issue

[dreais]

• cleaning code
• adding function to write to buffer
  • old wb_write becomes wb_append, and a new write one is added that clears buffer.
• get_active function for getting current window

• 14: trying to fix thread issue

  • having added a negative value to the timeout makes it infinite. the purpose is to block ANY operation that could take time, even if it's in micro second. that way, the main thread can have a better chance of catching up with the second thread.