minor maxent changes + added stopwatch
- minor maxent changes
- rewriting of maxent locally in progress b/c this is a high popularity model and some things can be improved (speed, plot outputs etc).
- added a simple stopwatch function to print time taken
- added to model functions as a wrapper, and manually in other locations (e.g. in build dataset)
- disable the gam mixed input test, it fails randomly, likely because the dataset or model params are not suitable. will update in future + investigate if gam mixed is functioning as intended