Merge branch 'master' into develop
Fix .qb exporter - don't export invisible voxels as black voxels.
Fix: Don't erase voxels when right-clicking with CTRL to rotate.
Limit size of Qubicle models imported to 127x127x127.
Warn the user when importing Qubicle files with multiple matrices.
Add other ways to zoom in/out - menu items, toolbar buttons, short cut keys.
Adds windows installer script, closes #33.
Merge branch 'develop'