Smaller logging and setup improvements

[FiB3]

I've created following improvements:
Fixed:

• setup: login & error page customer keys were missing version,
• problem on logger (DE Appender) for maximum Message Field length - new function that shortens the text,

Added:

• minimal scopes (description) for Installed Package in setup (for those security oriented orgs),
• field on setup to set Logger (and Error Log) Message field length. 4K long field can cause problems with SFMC performance in production.