Remove dead-code: not used static member CPluginTab::s_activeTab

Review: https://github.com/adblockplus/adblockplusie/pull/2
Remove dead-code: get rid of obsolete BEGIN_OBJECT_MAP because `OBJECT_ENTRY_AUTO` is already used.

Review: https://github.com/adblockplus/adblockplusie/pull/2
Use std::thread instead of calling CreateThread explicitly.

First of all instead of `CreateThread` the function `begintheadex` should be
called, to avoid any kind of leakages in crt, secondly the handle should be
closed. But the most reliable way is to use std::thread and delegate this
routine of handling MS Windows specific stuff to MS team.

Review: https://github.com/adblockplus/adblockplusie/pull/2
Fix position of the opening {

Review: https://github.com/adblockplus/adblockplusie/pull/2
Fix signatures of thread functions.

Review: https://github.com/adblockplus/adblockplusie/pull/2