Remove DomainAware from ERC20Token and ERC721Token

Description

Removes the DomainAware contract from ERC20Token and ERC721Token

Motivation and Context

Currently, the DomainAware uses the chainId opcode to determine what chain the current Contract is running on. However, some internal tools do not support this opcode (yet), and since these tokens aren't ever doing any signing verification (unlike ERC1400Token) it is safe to remove for now to get internal tools working.

Once internal tools have been updated to support the chainId opcode, this should be added back to these contracts

How Has This Been Tested?

All unit tests are passing, currently nothing was using the DomainAware contract for ERC20Token and ERC721Token

Types of changes

[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

[x] My code follows the code style of this project.
[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[ ] I have added tests to cover my changes.
[x] All new and existing tests passed.

Consensys / UniversalToken