Dave Collins 8dd7412a84 txscript: Rename Script to Engine. ...

This commit renames the Script type to Engine to better reflect its
purpose.  It also renames the NewScript function to NewEngine to match.

This is being done because name Script for the engine is confusing since
it implies it is an actual script rather than the execution environment
for the script.  It also paves the way for eventually supplying a
ParsedScript type which will be less likely to be confused with the
execution environment.

While moving the code, some additional variable names and comments have
been updated to better match the style used throughout the rest of the
code base.  In addition, an attempt has been made to use consistent naming
of the engine as 'vm' instead of using different variables names as it was
previously.

Finally, the relevant engine code has been moved into a new file named
engine.go and related tests moved to engine_test.go.

2015-04-20 15:31:23 -05:00

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