* cmd: Fix summary of few "L" sub-commands
* util: start decluttering plugins handling
- Add Doxygen docs
- Remove unused API functions and make others internal only
- Use RzLibType enum for plugin type instead of int
* util: move dlopen/dlsym/dlclose to rz_sys
* util: make rz_lib_open/close return bool
* util: simplify rz_lib_add_handler and rz_lib_open*
* libs: implement rz_*_plugin_del to remove a plugin
* core: remove commands from RzCmd when removing plugins
* librz: call plugins 'fini' method when removing a plugin
* core/cmd: do not fail if the hashmap removal fails
When removing a group command, the inner command might have the same
name, thus it would result in trying to remove the same name twice.
Ignore it, as it is fine.
* librz: make RzCrypto plugins handling like the others
* librz/crypto: add rz_crypto_reset and use it
* librz: allocate the plugin structures before adding them
