Merge in features for v1.7d

[slayergod13]

See the release notes on reddit

More technical notes though:

• Shifted the usage of Stormlib directly into BH instead of in the injector. This allows the client to access the tables more easily and makes the code more portable and support other injectors. This was accomplished by shifting all of the core logic into another thread on injection. Since threads spawned inside the loader lock do not start until the loader lock is released this does not cause issues when the Stormlib is loaded.
• A threadpool class was added for queueing up tasks that may be longer running to execute asynchronously.
• Maphack doodads can be recycled across frames ('max ghosts' in the BH.cfg) this reduces the framerate impact of lots of doodads being rendered on screen
• Item filter no longer uses exceptions as control flow, this results in slightly improved speed for this feature.
• Auto inject feature and cpu overusage patches merged in from Clucksoft.

[underbent]

I haven't been very active with this stuff lately, but this looks good, particularly the stormlib changes, the way it worked before was a big kludge.

One small thing: glancing at this I noticed some of the mpq text files (ItemStatCost, etc) are now checked in? Are they used for anything? The reason for switching to stormlib was to allow running on custom servers like slashdiablo event, and reducing the reliance on hardcoded game data (obviously there was still a lot of work to do on this); checking in data txt files seems like a step in the other direction.

[slayergod13]

The mpq text files should no longer be required. They were in there in an earlier commit, but should have been removed since. I also have not been active on slash lately either, though I have not received any critical bug reports lately about my branch so I believe it should be stable.