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Vendor dex-js token list for script (#992)

This PR vendors the `dex-js` token list and modifies the script to read token lists from the local file system.

### Test Plan

Run the script and see that it works with and without a specified token list:
```
$ yarn truffle-exec scripts/add_token_list.ts
yarn run v1.21.1
$ sh -c 'npx truffle exec build/common/${0%.*}.js $@' scripts/add_token_list.ts
Using network 'development'.

2020-09-24 20:34:19,506 INFO [scripts.add_token_list] Using default token list
2020-09-24 20:34:19,510 INFO [scripts.add_token_list] Token list with 17 tokens, filtering for network '1600971633613'
2020-09-24 20:34:20,865 INFO [scripts.add_token_list] Attempting to register 0 tokens
Done in 4.61s.
$ yarn truffle-exec scripts/add_token_list.ts --token_list scripts/data/tokenList.json
yarn run v1.21.1
$ sh -c 'npx truffle exec build/common/${0%.*}.js $@' scripts/add_token_list.ts --token_list scripts/data/tokenList.json
> Warning: possible unsupported (undocumented in help) command line option: --token_list
Using network 'development'.

2020-09-24 20:34:27,963 INFO [scripts.add_token_list] Reading token list from 'scripts/data/tokenList.json'
2020-09-24 20:34:27,971 INFO [scripts.add_token_list] Token list with 17 tokens, filtering for network '1600971633613'
2020-09-24 20:34:29,292 INFO [scripts.add_token_list] Attempting to register 0 tokens
Done in 4.47s.
```

Note that no tokens are registered as the token list does not contain any test-net tokens.

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