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clean up a bit, start some documentation

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Kurt Wilson 2022-03-31 13:37:03 -04:00
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This contains two packages:
- `simple_timer` contains timing related functions, and a wrapper for calling some kernel scheduling functions
- `priority_executor` contains the modified executor and some nodes to test it
In `priority_executor`:
- `priority_executor.cpp` subclasses `rclcpp::Executor` to allow for additional customization
- `priority_memory_strategy.hpp` is a modified version of `rclcpp`s `allocator_memory_strategy.hpp` that selects callbacks based on either the earliest deadline, or a relative priority. Executor polls this for ready callbacks.
- `test_nodes.cpp` adds timer-based publishing nodes and dummy worker nodes that can be arranged in chains. It uses `dummy_workload.hpp` to generate a workload.
- `f1tenth_test.cpp` sets up a chain of nodes similar to [https://intra.ece.ucr.edu/~hyoseung/pdf/rtas21_picas.pdf](https://intra.ece.ucr.edu/~hyoseung/pdf/rtas21_picas.pdf)