Use standard import placeholders

[joshuahannan]

Updates all the contracts, transactions and scripts to use the standard import placeholder format import "...." instead of the old format.

I know there are a lot to review, but the changes are exactly the same for every file, so it shouldn't take too long to review

The flow-evm bridge is now using the core contracts templates package to replace import placeholders and uses the current format, so this needs to be updated to support that.

I'll work on updating flow-go transaction as well.

Flag: Tests are failing because flow-go relies on the old package that replaces addresses based on the old format. To get tests to pass, we'll need a new version of the emulator with this change.

[joshuahannan]

Once I get an approval on this, I will tag a pre-release based off this branch so I can update flow-go

[janezpodhostnik]

I spot checked some files and it looks good to me, but I didn't go through everything. Please let me know if there are any files I need to specifically check.