add additional command buffer error checking using test queues #127
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Adds an option for enhanced error checking, disabled by default. Enhanced error checking creates special test queues when a command buffer is created, and enqueues a barrier blocked by a user event into the test queue. Then, before a command is recorded into a command buffer, it is also enqueued into the test queue, to identify command errors. When the command buffer is finalized the user event is set to an error state, causing all of the commands in the test queue to be terminated.
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fixes #95
Adds additional command buffer error checking using "test queues", see slide 18 in:
https://www.iwocl.org/wp-content/uploads/6895-James-Brodman-Intel.pdf
Because this additional error checking relies on tricky user event behavior that may not work on all implementations it is disabled by default, but may be enabled with an environment variable.