initial stubs related to error handling device

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split configuration options out of Makefiles

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nga-c: add internal "interactive" flag to VM state information (#94)

FossilOrigin-Name: 7c5ed4e2a5b64dd3e55be32525c423df55287d0e2726a80ac2dcadf80e3262ca

nga-c: add calls to stack guard function to remaining instructions (#96)

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more use of d:set-source

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slightly smaller/faster backspace handling; more use of d:set-source

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more use of d:set-source instead of raw lookup/patching for initial source data; remove NoEcho variable

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fix use of deprecated word in markdown export examples

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nga-c: add guard() to most of the instructions (ref #96)

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switch to using hashed dictionary search by default

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remove deprecate words

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nga-c: remove unused files

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nga-c: split malloc and rng devices into separate files

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nga-c: move clock device to a separate file

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nga-c: split file device into a separate file

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nga-c: split ffi & multicore devices to separate files

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nga-c: split float device into a separate file

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nga-c: split unix device into a separate file

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nga-c: move socket device to separate source file

FossilOrigin-Name: 3a79e0050856cb1ae77c789f2ab302e13e465bce20f617982037fd9cc369d172

nga-c: add stub guard() function (ref #96)

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