Update to SDL2
Update gamepad.js to use new Joysticks interface
add boundingBox.dimensions to entity properties
use axis aligned bounding box for highlight and selection box instead of non-axis aligned box
Update max axis value to reflect maximum negative value
Add joystickWithName for PrioVR
make sure to not select other entities when clicking on a grab handle of a selected entity
dont allow stretching below a minimum dimension
correctly handle unselect and dont show highlight when other tool is active
display tickmarks on the current rotation overlay
fix shifting tickmarks
draw tickmarks for current roation correctly for pitch and roll as well
Merge pull request #3583 from ey6es/metavoxels

Added ray/dual contour intersection testing, cursors on dual contour surfaces, "material brush" for dual contour surfaces.
Merge pull request #3584 from huffman/sdl-update

Update to SDL2
Merge pull request #3585 from ZappoMan/editToolsImprovements

various edit tool fixes
Basic metavoxel scripting bits.