Move ModifierId to scorex-util (with Base* encoders moved from scrypto)

[greenhat]

Todo:

• [ ] wait for https://github.com/ScorexFoundation/Scorex/pull/271 to be merged and rebase this PR;
• [ ] wait for https://github.com/ScorexFoundation/scorex-util/pull/5 (scorex-util v1.1.0) to be merged;
• [ ] wait for https://github.com/input-output-hk/scrypto/pull/54 (scrypto v2.1.3) to be merged;
• [ ] wait for a scorex-util v1.1.0 (with Base* encoders) to be published;
• [ ] switch from snapshot version to the public v1.1.0;
• [ ] wait for a scrypto v2.1.3 (with Base* encoders moved to scorex-util) to be published;
• [ ] switch from snapshot version to the public v2.1.3;

[greenhat]

Close in favor of soon to be updates #303.