extend default config and fix scrolling

[achimmihca]

• added missing (but available) parameters to default config
  • Stuff like DEAD_ZONE, SCROLL_DEAD_ZONE, TRIGGER_DEAD_ZONE and SCROLL_SPEED is already implemented but was not documented.
• fix scrolling: must be an int
  • before, a float was passed to mouseEvent(...) which was causing issues.
• apply getDelta(...) to tx and ty before any calculation is done
  • otherwise some calculations could have been done with wrong value already
• pass magnitude to getMult instead of lengthsq
  • magnitude calculation can be simpler for scrolling because dimensions (X and Y) are handled independently (in this case magnitude is abs(deltaValue))
• main.cpp : added (hard coded) build date to console output
  • motivation: I did not find any version information. This is needed to let users know which parameters are available and what is (not) working in their version.

[KeneePatel]

Really think this should be merged. Also, if you know of any other program or tool which do a better job than this. Let me know!

[achimmihca]

if you know of any other program or tool which do a better job than this. Let me know

I created a fork and a build that includes the changes of this PR: https://github.com/achimmihca/Gopher360/releases/tag/v1.0-achimmihca-fork