Fix compilation errors on Windows

Summary

Resolves #34 (closed), #75 (closed) and #85 (closed).

Focus

Windows compatibility has been brought to a point where in Release build mode, caosdb.dll, ccaosdb.dll and the test CLI clients build without errors. The clients are also able to start (function was not tested yet). To achieve this a few changes were necessary:

• The GRPC_GENERATED sources have to be added to the ccaosdb library. Just linking is not enough on Windows (see #90 (closed)). This should not and does not seem to have an impact on the Linux build.
• The splitting of the GRPC_GENERATED from the main library for the Debug/Test was removed as it does not work on Windows (see #90 (closed)) and does not provide any advantage on Linux.
• Linking to stdc++fs for using has been removed. This was only necessary for gcc<9.1.
• Retrieving the HOME folder on Windows was added in include/caosdb/utility.h (enabled/disabled via a macro)

Note that there is not yet a pipeline for Windows. Unit tests are anyway not yet functional (see #90 (closed)).

Test Environment

Follow build instructions for Windows.

Check List for the Author

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• Appropriate user and developer documentation (or not necessary)
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

doc/Install_develop.rst

@@ -110,23 +110,20 @@ We use `Visual Studio
 as compiler. We use `cmake <https://cmake.org/download/>`__ as build
 tool.
 
-1. clone/update the subrepo ``git submodule update --init proto``
-2. :code:``conan install .. -g visual_studio -s arch=x86_64 -s build_type=Release -s compiler.toolset=v142 -s compiler.version=16 -s compiler.runtime=MD --build=missing --update``
-3. ``cd build/Release``
-5. ``cmake -B . ..``
-6. open ``libcaosdb.sln`` with Visual Studio, change the buildtype to
-   ``Release`` and build the project. (You can open Tools/Command
+1. Install Python and create a virtual environment with the dependencies in `requirements.txt`.
+2. Activate the environment run in the repository folder: :code:``conan install . - --build=missing -s build_type=Release``
+3. ``cmake --preset conan-default``
+4. Open ``libcaosdb.sln`` with Visual Studio, change the buildtype to
+   ``Release`` and build the project (ALL_BUILD). (You can open Tools/Command
    Line/Developer Command Prompt and execute
    ``msbuild libcaosdb.sln /property:Configuration=Release``)
+5. Try running the cli clients in ``.\build\Release\``.
 
 Known problems
 ^^^^^^^^^^^^^^
 
--  Linking dynamic libraries currently fails on Windows. So probably
-   other CaosDB libraries which make use of libcaosdb also will not
-   build. This is a known bug and we hope to fix this in the next
-   release. See
-   `#34 <https://gitlab.indiscale.com/caosdb/src/caosdb-cpplib/-/issues/34>`__
+-  Building the unit tests on Windows currently fails with linker errors. See 
+   `#90 <https://gitlab.indiscale.com/caosdb/src/caosdb-cpplib/-/issues/90>`__
 
 Troubleshooting
 ~~~~~~~~~~~~~~~