Updated version number to 2.1.9

Merge pull request #66 from tacoroumen/master

Added support for setting the Requestrr base URL and port using environment variables.

Update package-lock.json

Updated version number

Updated version number

Storing build number in code

- Stores build number in code, for future notes for logging info, etc.

Added check of build number at startup

- Added note at the start of program starting as to what version of the program this is

Update SlashCommandBuilder.cs

- Corrected handling multiple categories

Corrected Textbox

- Textbox is not resetting after updating state