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Remove unused functions

Closes #22
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Closes #21
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the xeddsa and vxeddsa verify strictness check had a return
value incompatible with the verify function's return value,
causing a strictness check failure to be interpreted as a
signature verification success.

This change also removes some other old/vestigial code.

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Fixes #11

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This will also get rearranged in the new codegen

Fixes #6
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Fixes #9

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Dynamically allocate working buffers instead.

Closes #3

Sometimes, for whatever reason, native code fails to get installed
on some small percentage of Android devices.  In contrast to every
other device, on LG devices, the call to System.loadLibrary
 *succeeds*, and then the individual native calls throw exceptions.

This change allows the degredation path to work correctly on LG.