GitLab

Added RPC calls for creating/activating promises.
Added events.
Started mocking out contracts.

Added Bank Withdraw RPC function
Order and Bank proto's now share currency enum.

Order requests now include a currency field for future use.
Added Manifest Request and Reply messages.
Manifest request is a duplicate of Order Status request I know, but I
wanted to decouple it in case we change it in the the future.
Reduced bank balances from int64 to int32, seemed overkill and wasteful.
Removed redundant currency field from BankGetRequest since the reply
always includes all currencies.

Fixed gRPC defs
Rename OrderStatus to OrderStatusEnum to reflect type.

Bank Get Request now requires currency Enum (Currently only Silver)
Colony messages updated, Added Mods and Tradable messages to package.
Added Seed and X/Y Co-ordinates to ColonyData message.
Colony Update Request now requires Game Tick at the bare minimum
(Server side check).
Colony can no longer change it's Name or Faction once created,
setting these during update will simply be discarded.
Only updatable fields are currently UsedDevMode, Tick and GameVersion.