update core

[rwmcintosh]

No description provided.

[rwmcintosh]

Pavel is going to update the snapshots and get this to pass CI checks before we merge this branch

[Felixmil]

This hotfix/11.3 contains very old code that is unsynced with develop.

1. Is hotfix/11.3 really the target branch ?
2. If so, shouldn't hotfix/11.3 be updated with develop content ?

[Yuri05]

This hotfix/11.3 contains very old code that is unsynced with develop.

1. Is hotfix/11.3 really the target branch ?

2. If so, shouldn't hotfix/11.3 be updated with `develop` content ?

1: yes
2: no

The version is synced with the upcoming 11.3 hotfix release of the OSP suite and should not get any newer v12 features from the develop branch.

[Felixmil]

I add fixed package versions corresponding to the AppVeyor's installation script for this release.
Necessary because some breaking changes were included in tlf without backward compatibility.

[Yuri05]

@rwmcintosh I retriggered manualy the nightly build and it failed

rake "prepare_for_build[%APPVEYOR_BUILD_VERSION%, 'hotfix/11.3']"
OpenURI::HTTPError: 404 Not Found
...
Downloading setup.zip from https://ci.appveyor.com/api/projects/open-systems-pharmacology-ci/pk-sim/artifacts/setup.zip?branch='hotfix/11.3' under C:/temp/pk-sim/setup.zip

Do we really need '' in 'hotfix/11.3' ?
Let's remove '' in 'hotfix/11.3'

[rwmcintosh]

yeah, maybe not. I'll change it