Mv opcodes, opFns and logTable to lib/vm

[s1na]

This is a part of a larger refactoring effort to modularize evm code and prepare for later integration of ewasm.

The other PR didn't properly detect these file renames and produced a huge diff. This PR only moves logTable.js, opcodes.js and opFns which are internal to evm to lib/vm.

[coveralls]

Coverage remained the same at 91.018% when pulling b35f49a on refactor/vm-1 into 8d6ec92 on master.

[holgerd77]

Looks good, all this is internal, did also do code searches for file references which might have been forgotten.

This should nevertheless be mentioned in release notes encompassing the changes in case someone has monkey-patched around this. 🐒 😄