* renamed gem unicorn to unicorn-engine
* renamed modules to unicornengine
* renamed Module Unicorn to UnicornEngine and the gem unicorn-engine to unicornengine
* unicornengine -> unicorn_engine
* fix mem_unmap and query for Ruby bindings
* ruby bindings: fix issues with GC freeing callbacks while we still have references to them
* ruby bindings: add test for garbage collection of hooks
* ruby bindings: let the VM garbage collect hooks properly this time
* ruby bindings: update garbage collection test to make sure Proc is garbage collected after Uc is collected
* ruby bindings: fix m_uc_hook_add to return the ruby VALUE with proper memory management instead of making another one with bad memory management
* ruby bindings: fix cb_hook_intr signature
* add architecture query
* ruby bindings: only treat certain x86 registers specially if we're actually on x86
* only treat certain x86 registers specially if we're actually on x86 (uc_reg_read and uc_reg_write)
* ruby bindings: read and write ARM64's 128-bit NEON registers
