Kernel: Rewrite ProcFS.

Now the filesystem is generated on-the-fly instead of manually adding and
removing inodes as processes spawn and die.

The code is convoluted and bloated as I wrote it while sleepless. However,
it's still vastly better than the old ProcFS, so I'm committing it.

I also added /proc/PID/fd/N symlinks for each of a process's open fd's.

Author: awesomekling

Kernel/Makefile

@@ -16,7 +16,7 @@ KERNEL_OBJS = \
        Console.o \
        IRQHandler.o \
        kprintf.o \
-       ProcFileSystem.o \
+       ProcFS.o \
        RTC.o \
        TTY.o \
        PTYMultiplexer.o \

Kernel/MemoryManager.h

@@ -201,7 +201,7 @@ class MemoryManager {
     friend class PhysicalPage;
     friend class Region;
     friend class VMObject;
-    friend ByteBuffer procfs$mm(SynthFSInode&);
+    friend ByteBuffer procfs$mm(InodeIdentifier);
 public:
     static MemoryManager& the() PURE;