Adds new AllowPooledString func to CHalfLife2 to allocate a string in the game's string pool.
Also fixes SetEntPropString using incorrect offset for nested sendprops.
(these were already considered deprecated, but now the compiler will officially complain about them)
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extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%402225
Various minor things done to project files
Updated sample extension project file and updated makefile to the new unified version (more changes likely on the way)
Updated regex project file and makefile
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extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%401971