Optimize Switch Expression

[jogibear9988]

Code generated from Switch Expression is not yet optimal:

• [ ] Use Switch IL Code for Integer, long, ... (if possible). When int difference is less then 3 it should be used!
• [ ] Optimize Equal check, atm equal check is done, and then branch if true. This could be combined to one command
• [ ] Use ComparisonMethod of Switch Statement

[jogibear9988]

see #127

[dadhi]

The newer umbrella is #397