* add some types to XAxisModel
* Add UI to toggle log mode.
* handle autoscale toggle for logMode
* add log plot tests
* test log ticks work after refresh
* add an initial manually-created visual snapshot test of log plot chart
* update plot unit tests for log mode
* remove scale variable for now
* make v-for keys unique per template to avoid a small performance hazard of v-for markup in the same subtree of a template having clashing keys (Vue quirk)
Co-authored-by: unlikelyzero <jchill2@gmail.com>
Co-authored-by: John Hill <john.c.hill@nasa.gov>
Co-authored-by: Shefali Joshi <simplyrender@gmail.com>
