Getnative

+ version bump that was missing
+ make importing getnative into existing scripts easier

+ merge 14 which implements better plot ticks

+ Update README with better installation instructions (thx RollingStar)
+ **Getnative needs descale version >r3**, implemented an error if your version is older

Breaking:
+ **The support for descale_getnative ended! Use [descale](https://github.com/Irrational-Encoding-Wizardry/vapoursynth-descale)**
+ Allow python3 -m getnative to run the application (thx Stux)
+ With this change `run_getnative.py`was removed. [README](https://github.com/Infiziert90/getnative#usage)

breaking:
- CLI command changed: e.g. `python3 getnative.py .....` -> `python3 run_getnative.py .....`
- default output dir changed: getnative/getnative -> (CWD)/results
- renamed argument: (-img-out, --generate-images) -> (-mask, --output-mask)

new:
- added support for installing getnative via pip:
with this you can call it via `getnative` in your CLI
- getnative is now on pypi: https://pypi.org/project/getnative/
- added an argument to set the output dir (-dir,--output-dir)

minor:
- Let the user know that (-ns, --no-save) disables all output arguments
- updated the readme
- fix progressbar getting deleted
- fix mask output with stepping would have wrong resolution in the filename

breaking:
+ dropped lanczos5 as predefined scaler for descale_getnative
+ return values from analyze_result(self, vals) changed
+ generated filenames are different from before
+ scaler_dict is now common_scaler with a different composition

new and breaking:
+ added spline64 as predefined scaler (needs descale version r3)
+ added bicubic 0.5 0.5 and lanczos2 as predefined scaler

new:
+ (-steps, --stepping):
This changes the way getnative will handle resolutions. Example steps=3 [500p, 503p, 506p ...].
It will speed up the process, but be warned! This is not a true search anymore …
when the original is something like 810p and you select the wrong stepping, you will miss it!!
Default is 1 like it was always …
(Original from LittlePox :3)

+ getnative can now use both descale and descale_getnative (frechdachs & OrangeChannel)
at the same time. This allows stuff like running -m „all“ with lanczos5 and spline64 without
crashing the script because descale_getnative can’t handle lanczos5, but still having
the performance for all other scaler

changes:
+ massive cleanup
+ changed some error messages
+ graphs will look somewhat different, but are still the same
+ —plot-format will now accept a List with comma+whitespace seperated items