Fix reading binary columns

[learn-more]

Also add a debugger check to the appx package check,
so that the application can be started from visual studio

[wjk]

I placed that check in OnStartup because while it might run just fine outside of the AppX package now, I might add API calls that require running inside the AppX package later. I add this check both to cover that possibility, and to remind me to always use the packaging project when I debug. I ask that you remove it from the PR, and then we'll be able to merge. Thanks!

(Also: How did you come across this bug? I've tested it on multiple MSI files, including Orca.msi, and never had any problems.)

[learn-more]

I placed that check in OnStartup because while it might run just fine outside of the AppX package now, I might add API calls that require running inside the AppX package later. I add this check both to cover that possibility, and to remind me to always use the packaging project when I debug. I ask that you remove it from the PR, and then we'll be able to merge. Thanks!

(Also: How did you come across this bug? I've tested it on multiple MSI files, including Orca.msi, and never had any problems.)

Removed the other commit.
Too bad, that makes debugging somewhat more annoying, since I have to remove the packaged version.

I encountered this bug while trying to add a new feature to the tool, where you can browse all tables.