added stack-based syntax checker and anonymous channels

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syntax checker:

public void checkSyntax(Token token, Stack<Integer> state_stack);

adds CompileError s to CompileError's errors set if it encounters any misplaced tokens.

anonymous channels are dimension hashes without identifiers:

source<b,c> | <b,c> | <c>

the parser will simply add an arbitrary unique identifier to them:

source<b,c> | ___anon_1<b,c> | ___anon_2<c>