Update get-issues-and-prs.py script.

[ericonr]

It was missing some repositories, so stop hardcoding those.

Make it capable of listing stale issues and PRs as well.

Sample output:

- areaDetector:
    - PRs:
        - [ ] [Add ADPimega as a submodule (branch: lumentum-v3)](https://github.com/areaDetector/areaDetector/pull/95)
- ADCore:
    - Issues:
        - [ ] [Out of bounds read/type confusion in compressed arrays with NDPluginStdArrays, can cause segmentation fault](https://github.com/areaDetector/ADCore/issues/531)
        - [ ] [Convert NDPluginPva to use PVXS](https://github.com/areaDetector/ADCore/issues/528)
    - PRs:
        - [ ] [Convert NDPluginPva to use PVXS](https://github.com/areaDetector/ADCore/pull/532)
- ADEiger:
    - Issues:
        - [ ] [The lz4 data in Stream2 is different from Stream](https://github.com/areaDetector/ADEiger/issues/69)
        - [ ] [Driver is copying data twice for each frame in Stream mode, not efficient](https://github.com/areaDetector/ADEiger/issues/68)
        - [ ] [Support Stream2 CBOR format and multiple threshold frames](https://github.com/areaDetector/ADEiger/issues/65)
- ADLambda:
    - Issues:
        - [ ] [Probable bug in driver](https://github.com/areaDetector/ADLambda/issues/13)
- ADPICam:
    - PRs:
        - [ ] [Implement pulse parameters and re-populate enums after a parameter is marked as existing](https://github.com/areaDetector/ADPICam/pull/26)
- ADPcoWin:
    - Issues:
        - [ ] [Linux support?](https://github.com/areaDetector/ADPcoWin/issues/24)
- ADPilatus:
    - PRs:
        - [ ] [Check for 7 OK message when waiting for an image to actualy end the acquisition](https://github.com/areaDetector/ADPilatus/pull/17)
- Stale Items:
    - Stale Issues:
        - [ ] [HDF5 plugin feature where datasets with type=constant is broken](https://github.com/areaDetector/ADCore/issues/36)
        - [ ] [Find a way to stop misbehaving plugins from slowing down driver](https://github.com/areaDetector/ADCore/issues/98)
        - [ ] [HDF5 NDAttribute datasets to support "extra" dimensions like detector datasets](https://github.com/areaDetector/ADCore/issues/96)
        - [ ] [Expand CI services to cover more configurations](https://github.com/areaDetector/ADCore/issues/115)
        - [ ] [option to not write NDAttr* attributes in HDF5 dataset](https://github.com/areaDetector/ADCore/issues/145)
        - [ ] [MEDM slider behaves badly on some Windows systems](https://github.com/areaDetector/ADPhotron/issues/6)
        - [ ] [Allow use of the 2nd ethernet port of the SA-Z for data transfer](https://github.com/areaDetector/ADPhotron/issues/7)
    - Stale PRs:
        - [ ] [prosilica.cpp:](https://github.com/areaDetector/ADProsilica/pull/4)
        - [ ] [Added new prosilica resend params and rates for packet counts](https://github.com/areaDetector/ADProsilica/pull/7)
        - [ ] [Added driver support for NDBitsPerPixel and NDBytesPerPixel parameters](https://github.com/areaDetector/ADProsilica/pull/8)
        - [ ] [Added redef of Gain in prosilica.template so we can set driver limits](https://github.com/areaDetector/ADProsilica/pull/5)
        - [ ] [FIX: call start() after NDEdgePlugin object is created for plugin to work for ADCore >= 2.5,  don't process plugin if input NDArray dimension > 2 (i.e. for Color modes)](https://github.com/areaDetector/ADPluginEdge/pull/3)
        - [ ] [Slac edl](https://github.com/areaDetector/ADCore/pull/316)
        - [ ] [Applied bitsPerPixel.patch to bring in bitsPerPixel support from pcds…](https://github.com/areaDetector/ADCore/pull/314)

[henriquesimoes]

I didn't notice this was a PR before. Just a few suggestions.