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Improve setup and add small programmability introduction. #123

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10 errors and 11 warnings

mismatched types

could not compile `pie` (lib test) due to previous error

impl has stricter requirements than trait

could not compile `pie` (lib test) due to previous error

test failed, to rerun pass `--lib`

test failed, to rerun pass `--test top_down`

The following actions uses node12 which is deprecated and will be forced to run on node16: ATiltedTree/setup-rust@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

fields `file_to_node` and `task_to_node` are never read

variants `File` and `Task` are never constructed

methods `get_or_create_file_node`, `get_or_create_task_node`, and `get_task` are never used

methods `task_has_output`, `get_task_output`, and `set_task_output` are never used

methods `get_dependencies_of_task`, `add_file_require_dependency`, and `add_task_require_dependency` are never used

method `reset_task` is never used

`pie` (lib) generated 6 warnings

unused import: `crate::context::top_down::TopDownContext`

unused variable: `task`

fields `store` and `current_executing_task` are never read