This commit condenses all changes made in
amyspark/T13097-gsoc2020-seexpr into the master branch.
It includes all changes up to commit
660b0716, plus the necessary adjustments
for the new resource system. I have included the load functionality as
part of the already commented out blocks of code.

This commit increases the databaseVersion of Krita to 0.0.3, since there
is no functionality yet to pick up new resource types.