Changes from 1.2 to 2.0:

    Add missing system header import
    Update buildtools submodule d49b922..6656431
    Add call to objc_startCollectorThread()
    Git: ignore "build" folder created by Xcode
    Bump version number for 2.0 release
    Bump copyright dates in man page
    Remove unneeded PowerPC code
    Rename "Run script" phase
    Rework references to buildtools
    Update references to buildtools files
    Add buildtools as a submodule
    Remove redundant autotest require
    Teach autotest to re-run specs when executable changes
    Really add double-hyphen form
    Update man page to use double-hyphen form
    Update date in manual page
    Bump version number post-release