Query namespace renamed
Variables access withing contexts; Parse context (for resolving types and routines while parsing); Query nodes moved to Sql.Query namespace; Indexes definitions; Cursors definitions; Routines resolving
Merge branch 'master' of github.com:deveel/plsqlparser

Conflicts:
	src/PlSqlParser.NUnit/Deveel.Data.DbSystem/TestDatabase.cs
	src/PlSqlParser.NUnit/Deveel.Data.Expressions/ExpressionTests.cs
	src/PlSqlParser.NUnit/Deveel.Data.Sql/QueryTests.cs
	src/PlSqlParser/Deveel.Data.DbSystem/IDatabaseConnection.cs
	src/PlSqlParser/Deveel.Data.DbSystem/IQueryContext.cs
	src/PlSqlParser/Deveel.Data.DbSystem/QueryContext.cs
	src/PlSqlParser/Deveel.Data.Sql/SqlQuery.cs
	src/PlSqlParser/Deveel.Data.Sql/SqlQueryExecutor.cs
	src/PlSqlParser/PlSqlParser.csproj