Adds Gambot.Data.SQLite project boilerplate

Adds System.Data.SQLite.Core nuget package reference
Implements a SQL-based data store (for SQLite); closes #16

Required key in App.config:
    Sqlite.DatastoreDirectory, e.g. "C:\gambot" or "/home/rob/gambot"
        Make sure the directory exists.
        Multiple .db files would get created; one for each module that requires a data store]

Note:
    LoadAssembliesFromPath(string) in Driver will need to change the search option to "TopDirectoryOnly" so that an exception is not thrown saying a manifest xml file is not found for SQLite.Interop.dll
Optimizes random value retrieval in the SQLite implementation to not be as cabbage
Merge pull request #16 from emilh91/master

Create SqlDataStore implementation