remove deadlock, define log level at compile time

- extend pipeline to test the kernel (#40)
- remove deadlock in the implementation of conditional variables
- add option to set LevelFilter at compile time (#53)

add interface to initialize CondQueue

add basic virwqtio support

fix issue by determing the cpu frequency

separate stack for kernel / user space

- introduce page guards to protect the stacks
- remove compiler warnings
- ensure CpuFrequency is never explicitly set to zero (PR #29)

add check if a task with higher priority is available

- wakeup handler checks if a task with higher priority is available
- if yes the handler calls the scheduler

completly revision of the scheduler

- lockless scheduling on a local core
- only the communication between cores is realized with protected cores
- cores use inter-processor-interrupts to trigger a queue check
- introduce a type to handle the CoreId => increase the readability of the code

remove deadlock during wakeup ipi

add support of the new memory allocator interface

simplify PIC initialization

add IO-APIC support for uhyve

add support of the latest version of AllocRef

support of the new memory allocator interface (see https://github.com/rust-lang/wg-allocators/issues/17)

remove compiler warnings, remobug in trampoline code

add  support of the latest nightly toolchain

add link to the repository

extend README

add pseudo workspace

remove dependency to xargo

Remove dependencies from original HermitCore linker, switch to rust-lld