Depends on D12532.
Initial commit for Rime Input Method Engine, the core library.
A few notes:
- 1.7.3 was tagged but not released, hence just for safety 1.7.2 is used.
- This package also includes plum, the Rime configuration manager and input schema repository. Usually this is packaged to a standlone package called rime-plum or rime-data, as seen for Arch and Debian. However, since it is not tagged and has no versioning, it is included in librime and the version will be determined by the submodule version in [ibus-rime](https://github.com/rime/ibus-rime).
- It's not included in ibus-rime because ibus-rime's build process require its cmake config file, which cannot be installed and detected by cmake if they're in the same package and being built together.
- For reference, here's the official guidance for downstream package managers on plum: https://github.com/rime/plum#install-as-shared-data