Define PLUGIN and PLUGIN{DATA,DOC,LIB}DIR for all plugins

This helps for locating data files, and to define those appropriately depending on the platform (Windows).

You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany-plugins/pull/404

Commit Summary

File Changes

Patch Links:

—
Reply to this email directly or view it on GitHub.