QbsProjectManager: Support using an installed qbs.
Distributions will want to make Creator work with their qbs package instead of adding it a second time via the submodule, so we support that by checking for the QBS_INSTALL_DIR environment variable. This supersedes the current mechanism using QBS_SOURCE_DIR and QBS_BUILD_DIR. Change-Id: I2cff651cd23ea47b1a1434e33f80cb74ca0fc96b Reviewed-by: Tobias Hunger <email@example.com>
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