Add support for Azure SQL DB

[VladDBA]

This is an initial brain dump, final result may vary somewhat.

If -ServerName contains database.windows.net then:

• if the value passed to -ServerName is in the form of myserver.database.windows.net,1433:MyDatabase, then PSBlitz will get the database name from there
• if -ServerName is in the form of myserver.database.windows.net,1433 or myserver.database.windows.net then PSBlitz will prompt for a database name
• the database name will be loaded in $ASDBName and internal flag $IsAzureSQLDB will be set to true

Behavior if $IsAzureSQLDB is true:

• the connection string will point to the value used for $ASDBName instead of pointing to master
• skip the following:
  • GetDbInfo.sql
  • GetInstanceInfo.sql
  • spBlitz_NonSPLatest.sql
• spBlitzWho_NonSPLatest.sql will output data to a "temporary" table in the database provided via $ASDBName
• GetStatsInfoForWholeDB.sql will get the USE [..PSBlitzReplace..]; portion removed dynamically
• GetIndexInfoForWholeDB.sql will get the USE [..PSBlitzReplace..]; portion removed dynamically and will be made to skip the BlitzWho output table from the check.