alter db object

Base on v1.0, the changes as following:

• Move "Clear Data" and "Empty Database" from DatabaseInterpreter.Core to DatabaseManager.Core
• Add alter operation for view/function/procedure/trigger
• Fix sql parse issue for select from multiple tables with comma, table alais with "as"
• Fix sql query editor intellisense: insert selected word and comment issue

pre release

This release includes the following main features:

• convert database
• translate database object script using antlr
• generate scripts
• create new sql query, and create function/view/procedure/trigger with it
• view data
• clear data
• empty database