Refactoring of Statement and Column classes

[Kacperos155]

As title says I refactored Statement and Columns with minimal changes to wrapper API.
List of all major changes:

• Replaced macro long size checks with fixed width ints for Statement::bind
  (Macros are still needed for "operator long" in Columns but not in Statement binds methods. Fixed width ints should properly detect size of long function parameter)
• Replaced Statement::Ptr with std::shared_ptr<sqlite3_stmt> (aliased as TStatementPtr) - need for this was mentioned there.
• Added Statement move assignment (and so fixing Feature request: move-assignment operator for Statement #347 )
• Column throws when created with empty pointer to prepered statement.
• Statement methods: getIndex, getColumn, getExpandedSQL are now const

[SRombauts]

This work was long overdue, I find it awesome that you tackled it and contributed back :)
Thanks!