Get version number dynamically from tag

[paddyroddy]

Fixes #219.

Following #231 the shared libraries are now built dynamically in CI. As a result, VERSION.txt is not needed, as we can dynamically get the version from the current tag.

The main advantage of this is it's one less thing to remember to update. Another is that we can have a current development version. For example, for me locally:

import btrack
print(btrack.__version__)

prints 0.5.1.dev160+g4a43956.d20230322.

[deprecated-napari-hub-preview-bot[bot]]

Preview page for your plugin is ready here: https://preview.napari-hub.org/quantumjot/btrack/244 Updated: 2023-03-22T12:55:37.618857

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 :tada:

Comparison is base (4a43956) 82.94% compared to head (e67ef24) 82.98%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #244 +/- ## ========================================== + Coverage 82.94% 82.98% +0.04% ========================================== Files 19 19 Lines 1560 1552 -8 Branches 263 260 -3 ========================================== - Hits 1294 1288 -6 + Misses 191 190 -1 + Partials 75 74 -1 ``` | [Impacted Files](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe) | Coverage Δ | | |---|---|---| | [btrack/constants.py](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL2NvbnN0YW50cy5weQ==) | `100.00% <ø> (ø)` | | | [btrack/libwrapper.py](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL2xpYndyYXBwZXIucHk=) | `96.22% <ø> (-0.07%)` | :arrow_down: | | [btrack/\_\_init\_\_.py](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL19faW5pdF9fLnB5) | `91.66% <100.00%> (+1.66%)` | :arrow_up: | | [btrack/config.py](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL2NvbmZpZy5weQ==) | `92.18% <100.00%> (+0.12%)` | :arrow_up: | | [btrack/core.py](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL2NvcmUucHk=) | `84.00% <100.00%> (+0.66%)` | :arrow_up: | | [btrack/io/hdf.py](https://codecov.io/gh/quantumjot/btrack/pull/244?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL2lvL2hkZi5weQ==) | `72.79% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe)

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[paddyroddy]

Looks good. Only concern is the possibility of a mismatch between the compiled version and the python library. I guess that now we have the CI compilation it should be less of an issue.

Yes, unfortunately that problem may exist but shouldn't be that common. As long as it is made clear to users who are developing locally that you must run build.sh first before doing pip install -e .. However, if you just run the latter you'll be missing the binaries anyway, so you'll get the right version.