* Create text_detection.py

#12270 #13429
**Deep Learning text detection sample (Python)**
- Tested on **Ubuntu 18.04** - OpenCV 3.4.3, OpenCV 3.4.4, OpenCV 4.0 (master branch)
- Python version supported - Python 2 and Python 3

* Fix trailing whitespaces

* Update text_detection.py

* Remove whitespace

* Remove comments

* Remove unused packages

* Update description

* Remove a forward method in dnn::Layer

* Add a test

* Fix tests

* Mark multiple dnn::Layer::finalize methods as deprecated

* Replace back dnn's inputBlobs to vector of pointers

* Remove Layer::forward_fallback from CV_OCL_RUN scopes

* Remove TensorFlow and protobuf dependencies from object detection scripts

* Create text graphs for TensorFlow object detection networks from sample

* Include preprocessing nodes to object detection TensorFlow networks

* Enable more fusion

* faster_rcnn_resnet50_coco_2018_01_28 test

* Support Mask-RCNN from TensorFlow

* Fix a sample

Multi-argument CV_Assert() is accessible via CV_Assert_N() (with malformed messages).

Found via `codespell -q 3 -I ../opencv-whitelist.txt --skip="./3rdparty"`

Enable Torch layers tests with Intel's Inference Engine backend.

* Added ResizeBilinear op for tf

Combined ResizeNearestNeighbor and ResizeBilinear layers into Resize (with an interpolation param).

Minor changes to tf_importer and resize layer to save some code lines

Minor changes in init.cpp

Minor changes in tf_importer.cpp

* Replaced implementation of a custom ResizeBilinear layer to all layers

* Use Mat::ptr. Replace interpolation flags