Isabelle2020->21: declare "thy_load (isac_example)" to Scala, partially

would involve IntelliJ IDEA;
see https://lists.cam.ac.uk/pipermail/cl-isabelle-users/2021-March/msg00047.html

 src/Pure

 src/FOL

 src/HOL

 src/ZF

 src/CCL

 src/CTT

 src/Cube

 src/FOLP

 src/LCF

 src/Sequents

 src/Doc

 src/Tools

 src/Tools/isac

 test/Tools/isac/ADDTESTS/session-get_theory/