Add a simple implementation of the ELFManager that is used by default

[shumpohl]

(Hopefully) fixes #751

[github-actions]

Test Results

       6 files         6 suites   5m 39s ⏱️
1 212 tests 1 156 ✔️   56 💤 0 ❌
7 238 runs  6 812 ✔️ 426 💤 0 ❌

Results for commit 3a334c1.

♻️ This comment has been updated with latest results.

[shumpohl]

@maxbeer99 @BrllsRX Can you test if this works on a live system?

[Nomos11]

by the way:
the zhinst toolkit has implemented own convenience functions to upload programs in recent updates.
However - this is not noted in the official changelog -, the compiler used there does not support the grouped mode (which is also not properly handled with exceptions) and is therefore not suitable for our use.

[shumpohl]

I will merge this now since there have been no complaints and the current master version is definitively faulty