OrderBy RANDOM(), Column selection, IEnumerable.Select handling in Where Expression, ...

[alexis-]

• Added OrderByRand() method to TableQuery (SQLite RANDOM() function)
• Added SelectColumns methods to TableQuery for usage in specifically selecting columns and arbitrary commands in SELECT statement
  • SelectColumns(params string[] propertiesName) which automatically generate SELECT statement with provided properties -> column name
  • SelectColumns(string selectSqlStatement, params string[] propertiesName) which allows specifying custom SELECT statement [e.g. SelectColumns(""{0}" * 2 as "DoubleValue"", "Value")]
• Added MapTo(bool selectFromProperties) method to TableQuery which allows mapping results to a custom class
• Added IEnumerable.Select case handling to TableQuery::CompileExpr in ExpressionType.Call if block which allows unfolding values in Where Expression
• Added GetTableName(TypeInfo t) to IColumnInformationProvider -- TableAttribute was not proxied through the provider, perhaps this is on purpose, or a simple omission ?
• Added broader "Constraint" detailed error result handling
• Added tests for above features
• Changed several of TableQuery's fields accessibility to protected, which allows derived class to custimize behavior (in my case, this was needed to create a bridge class for usage in generic Database providers)

[alexis-]

Just wondering, would this make it easier for you if I made separate PR for the different features ?

I don't mind putting some extra work or even lending a hand if this could help toward the new version.
Also, any thought on next nuGet package release ?

Many thanks for the hard work.
Alex