add supports of the latest version of hermit-entry

Implement GDB server using gdbstub

- switch to gdbstub as crate for GDB Remote Serial Protocol

using the latest KVM bindings

- Bump kvm-bindings from 0.3.0 to 0.4.0 #101
- fix bug in the evaluation of cpuid entries
- Bump goblin from 0.3.4 to 0.4.0 #100
- Bump byteorder from 1.4.2 to 1.4.3 #93

using atexit to store the log file

fix bug on macOS Big Sur

- fix emulation of the IO-APIC for macOS Big Sur #60
- added instrument feature using rftrace #64

reducing the number of VM exists

- prevent VM exits due to HLT/MWAIT instructions (#59)
- Improve Hugepage detection and parameters (#44)
- Add option to bind vCPUs to host CPUs (#51)

add support of relocatable binaries

Exclude tokio dependencies

add check to pass not more than MAX_ENVC variables

add support of relocatable kernel

improve the cpu frequency detectionwq

add option to determine the processor frequency by the CPU brand string

avoid delivering external interrupts

add debugging support on macOS