OneAdder/lingtypology: Release 0.5

New stuff:

1. Support for minicharts.
2. Support for color gradients (not only as colormaps).
3. Full support for setting up radius and opacity.
4. Support for Phoible datasets.
5. DB APIs are more united now (columns language and coordinates now without capital letters).
6. lingtypology.lingtypology is now called lingtypology.maps (no changes for users, just backend).
7. Minor features sorting improvements in lingtypology.maps.
8. Minor improvements in lingtypology.db_apis