Kernel: Per processor information is now stored in class Processor

This allows us to allocate processor stacks, and other per processor
structures dynamically in runtime. Giving processor stack to
ap_trampoline feels super hacky, but it works for now.

kernel/CMakeLists.txt

@@ -66,6 +66,7 @@ set(KERNEL_SOURCES
 	kernel/PCI.cpp
 	kernel/PIC.cpp
 	kernel/Process.cpp
+	kernel/Processor.cpp
 	kernel/Random.cpp
 	kernel/Scheduler.cpp
 	kernel/Semaphore.cpp