* Return shared_ptr from eventloop
* Add -Wdeprecated-copy-dtor warning
Produces a warning if classes don't have explicit copy operations if
they have a user-defined constructor.
This helps us stick to the rule of 5 (kinda, no warnings for missing
move operators).
* Clean up eventloop
* Fix compiler warnings
* Fix fs_event_handle_t name
This fixes a "bug" where polybar wouldn't reload on a configuration
file change on some configurations of vim, which don't actually issue
any IN_MODIFY events because they choose to move the file, replace it
with a new one, and then delete the file instead.
To work around this, we now also listen for IN_IGNORED which fires when
the file we are watching is destroyed. When this happens, we re-attach
the configuration file watcher to the new file and reload.
