Rename SqlQueryCreator to SqlBuilder and fix getInsertQuery() issue.

Signed-off-by: mariossotir <mai1211@uom.gr>
Rename SqlBuilder::getInsertQuery() to SqlBuilder::getInsertStatement().

Signed-off-by: mariossotir <mai1211@uom.gr>
Remove Model related code from the system.

Signed-off-by: mariossotir <mai1211@uom.gr>
Delete the Model class.

Signed-off-by: mariossotir <mai1211@uom.gr>
Add setters and getters to the ThreadTypeModel.

Signed-off-by: mariossotir <mai1211@uom.gr>
Merge branch 'master' of https://github.com/napster-x86/wbChat