r7 release

 * Improved tablet support [(KazutoMurase)](https://github.com/KazutoMurase/)
 * Fix to cylinder marker type [(KazutoMurase)](https://github.com/KazutoMurase/)
 * Fix to IM transforms [(eratner)](https://github.com/eratner/)
 * Fix to colored mesh resources [(eratner)](https://github.com/eratner/)