Add test directory to BulletSim

- This is not fully completed yet so it should not be considered ready.
Remove the test directory from bullet as its not really needed afterall.
[BULLETSIM UPDATE 1] Commit the first batch of backports for Bulletsim

- The updated version is not yet ready for testing and should not be considered stable.
- This is why it is in a seperate branch :)
[BULLETSIM UPDATE 1] Adding two new files

- BSConstraintSlider.cs
- BSConstraintSpring.cs

- Note: This is still under development and is not and should not be considered stable
- This is why it is in a branch for now :)
[BULLETSIM UPDATE 1] Remaining backporting completed

- This is not stable yet and is the reason it is in this branch.
Merge branch 'master' of https://github.com/emperorstarfinder/WhiteCore-Dev
[BULLETSIM FIX] Fixing using of convexhulldotnet as it is used
[BULLETSIM FIXES] Fix some using references as i forgot to add them

- This is what happens late at night when your tired :)
- This is not considered stable yet this is why I have it in this branch
[BULLETSIM FIX] Fix an out of place ;

- This is not yet stable this is why I have it in this handy branch :)
Merge branch 'master' of https://github.com/emperorstarfinder/WhiteCore-Dev
[BULLETSIM] Roll back to the whitecore current version

- Restarting the backports as theres tons of mistakes
update namespaces to remove the .Region. out of the namespace
[BULLETSIM UPDATE] Commit potential updated Bulletsim

- Still much work to do
- THis is not yet stable this is why I put it in this branch :)
[BULLETSIM UPDATE] Adding WhiteCore.Physics.Manager

- This should solve some issues in the new Bullet
- THis is not yet stable this is why I have it in this branch :)