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This is to help enable multi-target execution. We store a vector of targets and contexts. Currently this will only compile a single target, the PR #1672 is needed to enable multiple targets.

This will also serialize the targets and contexts.

When using the execution_environment or prog.get_context() it will always use the context from the first target assuming this is the "primary" target. Although, its unlikely a user would use execution_environment with a multi-target environment.

* Update is_supported
* Return object from is_supported
* Return by reference in interator

Added is_supported and get_target_assignments methods to the target and program, respectively, to eventually support multi-target compilation and execution.

Updated each source file in the repo with the existing license.

* Add compiler options

* Add copy operators

* Formatting

* Use run_passes in tests

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* Use run_pass in schedule test

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* Add compile_options to get_passes in target

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* Offload copy option

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* Copy using pinned memory

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* Improve performance of gpu copying

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* Dont copy

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* Always make an extra copy

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* Remove unused write op

* Add missing include

* Remove copy_to_gpu function in python api

* Make offload copy disabled by default on C++

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* Fix tidy issues

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* Fix namespace

* Fix python tests

* Turn clang format off since its broken

* Fix compile error on gcc 5

* Remove commented code