Defined the order of MXEvents in array.
Defined where the enumeration/pagination starts.
[MXRoom paginateBackMessages]: get messages from the store before making request to the hs
Use MXStore to store events
Improved MXNoStore role description. It stores no events but it indeed stores minimal information like tokens in memory to make the SDK able to work using it
Implement MXRoom.canPaginate with [MXStore hasReachedHomeServerPaginationEndForRoom]
Removed messages from MXRoom. We have MXStore now.
Started MXMemoryStore. Not yet tested. It was created to copy/past the old code that managed MXRoom.messages