Thelper

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* Add cli/config override for task compatibility mode setting

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* Cleaned up dependency lists, docstrings
* Fixed bbox iou computation with mixed int/float
* Fixed dontcare label deletion in segmentation task
* Cleaned up training session output directory localization
* Fixed object detection trainer empty bbox lists
* Fixed exponential parsing with pyyaml
* Fixed bbox display when using integer coords values

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* Fixed collate issues for pytorch >= 1.2
* Fixed null-size batch issues
* Cleaned up paramskwargs parsing in trainer
* Added pickled hashed param support utils
* Added support for yaml-based session configuration
* Added concept decorators for metrics/consumer classes
* Cleaned up shared interfaces to fix circular dependencies
* Added detection (bbox) logger class

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* Fixed nn modules constructor args forwarding
* Updated class importer to allow parsing of non-package dirs
* Fixed file-based logging from submodules (e.g. for all data)
* Cleaned and API-fied the CLI entrypoints for external use

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* Fixed travis timeouts on long deploy operations
* Added output path to trainer callback impls
* Added new draw-and-save display callback
* Added togray/tocolor transformation operations
* Cleaned up matplotlib use and show/block across draw functions
* Fixed various dependency and logging issues

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* Fixed torch version checks in custom default collate impl
* Fixed bbox predictions forwarding and evaluation in objdetect
* Refactored metrics/callbacks to clean up trainer impls
* Added pretrained opt to default resnet impl
* Fixed objdetect trainer display and prediction callbacks