Libglcmsw

- added kwargs to change GLCM neighbourhood (one per image!)
- switched to column-major tile addressing
- optimized kwargs
- cleaned unnecessary comments throughout all modules

- Optimized kwargs in submodule render.cpu
- changed default rowssave value from 42 to 80
- fixed mistake in libglcmsw.render.cpu.rasterrender description
- updated classes.py
- altered TODO.md

- Switched from list comprehensions to itertools.repeat() in process pool executors

- Added the SlidingWindow class