Feature/c tiffwriter

[jonasteuwen]

This implements a TIFF writer in C++. This has a few advantages in the future, even though it's not really faster. In C++ we could use this in downstream libraries to have the whole writing of tiffs and outputs in a multithreaded fashion.

In addition:

• Bump version to v0.7
• Removing the CLI utilities, as they are largely useless, also tests
• Remove parts of the color profile handling for internal_handler="pil"
• Reduce cyclic imports, rename dlup.types to dlup._types to prevent name clashes and such.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.53%. Comparing base (3a6a10f) to head (103ea69).

Files	Patch %	Lines
tests/test_writers.py	92.30%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #249 +/- ## ========================================== + Coverage 90.29% 98.53% +8.23% ========================================== Files 38 14 -24 Lines 3122 1091 -2031 ========================================== - Hits 2819 1075 -1744 + Misses 303 16 -287 ```

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