Introduce basic parser for the DOT language.

[misalcedo]

The goal is to have a language for programming in the large and in the small. The supervision structure is defined using the DOT language and custom attributes to allow for simple visualization of the actor system.

[misalcedo]

Bug with handling attributes that are not delimited by a semicolon or comma.

Need to add test for:123 = 456 789=000

Also a version with just a newline:

123 = 456\n789=000

and one with no space:

123 = 456789=000

[misalcedo]

todo:

1. port as enum
2. node statement

[misalcedo]

Verify that quoted strings support backslash by itself, with no character after it

[misalcedo]

Break up graph is mod into various files:

• attributes
• edge
• node
• graph
• mod (parse)

That way, testing is easier and the file is navigable.

Also, need to add test cases for full files.

Implement edge statements.

Lastly, document that this is a subset of DOT, not a 1:1 parser. For example, undirected graphs are not allowed. Subgraphs and clusters are fine.

Where DOT and this language diverge, DOT wins

Otherwise, we lose the ability to render the supervision tree.

[misalcedo]

Update parseattribute to use a new pub(crate parser for id = id. Then, implement the 2 remaining tokens (stmt, stmt_list)

Make token non-recursive

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