Rename underlying C library to equeue

[geky]

• Avoids conflicts with similarly named libraries/files
• Adopts single equeue prefix
• Maximizes the vowel to consonant ratio in the name

File changes:

events-c/events.* -> equeue/equeue.*
events-c/events_*.* -> equeue/equeue_*.*

Function changes:

events_tick_* -> equeue_tick_*
events_mutex_* -> equeue_mutex_*
events_sema_* -> equeue_sema_*
event_* -> equeue_event_*