Support multiple versions of file formats (file-based storage)

[oubiwann]

For background info on this ticket, see the config enhancement ticket:

• 53

Part of:

• 34

Tasks:

• [x] At the app-level, update configuration:
  • [x] storage backend
  • [x] file store version
• [x] Move existing data models into v1 module
• [x] Devise a mechanism for dispatching to the appropriate MFA based upon:
  • configuration
  • the API call made
• [x] Update all existing calls to old file store to use this
• [x] Create a new v2 module

Work continues (in new v2 module) with the following:

• 8

• 31

• 55

[oubiwann]

Current uses of storage file versions ...

In code:

apps/lmud/src/em_login.erl:75:    "{version, 1}.\n",
apps/lmud/src/em_login.erl:79:    "{version, 1}.\n",
apps/lmud/src/em_room.erl:262:    "{version, 1}.\n",

In data files:

data/objects/painting.dat:1:{version, 1}.
data/objects/sword.dat:1:{version, 1}.
data/rooms/room1.dat:1:{version, 1}.
data/rooms/room2.dat:1:{version, 1}.
data/rooms/room3.dat:1:{version, 1}.
data/rooms/test1.dat:1:{version, 1}

[oubiwann]

The new datamodel is here (currently only supports the "living" type): apps/lmud/src/lmud-datamodel.lfe

Once we get everything in there, it will be easier to make decisions about versioning the schemas ...

[oubiwann]

Done.