Add try-catch-finally exception handling block

[Serhioromano]

Try in ST? Where is it used? In what IDE? And why keywords start with __?

[nikvoronin]

• Why not?
• I know about CoDeSys 3 and Beckhoff TwinCAT 3.
• To highlighting the importance of the try-catch block.

[Serhioromano]

Oh my goodness! I totally was not aware of this possibility in Codesys! Thank you. Very nice PR!

[Serhioromano]

I've updated the extension to 1.7.3 with your new additions. You can update it in VS Code and use it with your new features.

[nikvoronin]

Thank you for your awesome extension!

[Serhioromano]

Do not forget to rate it and give a review!