Renamed VRTM module

[maxsam4]

Renamed VolumeRestrictionTransferManager to LockupVolumeRestrictionTransferManager.

Note
Name in factory has not been changed as LockupVolumeRestrictionTransferManager does not fit in bytes32

[satyamakgec]

Couldn't we use the TM as the suffix for TransferManager that will reduce the contract name and also open the space for writing the clear name for the TM?
so it will be like LockupVolumeRestrictionTM, PercentageTM, ManualApprovalTM, SingleTradeVolumeRestricitonTM etc.
using this we can easily return the name as a bytes32 datatype.
@pabloruiz55 WDYT?

[pabloruiz55]

@satyamakgec My concern is that introduces some discrepancies with older versions.
Let's start by doing that with newer TM modules only for now. So, @maxsam4 for this one and single trade let's rename them to xxxTM