pcb-rnd hacking - plugin naming conventions

• export_: export plugins start with export_; these render to a non-native format that can not be then loaded
• import_: import plugins start with import_; these perform partial data load from alien formats (typically: netlist/schematics)
• io_: full board save/load prefixed with io_; even if your plugin can now only load or save, if it's possible to do a load-save-load round-trip without data loss, it's an io_
• hid_: interactive, often GUI, frontends are prefixed with hid_
• fp_: footprint access plugins start with fp_
• lib_ plugins are libraries used by other plugins; they are disabled by default and are enabled through the plugin dependency system
• act_ plugins are stateless wrappers to expose existing C functions (moslty core functionality) over the action API (for scripts and users)
• ar_ plugins are related to external autorouting: they are reponsible for calling the external process and coordinate the routing but sometimes also implement export/import pair for the format
• anything else is considered a feature plugin and has no specific prefix.