Kernel: Introduce the DevFS

The DevFS along with DevPtsFS give a complete solution for populating
device nodes in /dev. The main purpose of DevFS is to eliminate the
need of device nodes generation when building the system.

Later on, DevFS will assist with exposing disk partition nodes.

Base/etc/fstab

@@ -1,14 +1,12 @@
 # Root file system. This is a fake entry which gets ignored by `mount -a`;
 # the actual logic for mounting root is in the kernel.
 /dev/hda / ext2 nodev,nosuid,ro
-# Remount /bin, /dev, /root, and /home while adding the appropriate permissions.
-/dev /dev bind bind,nosuid,ro
+# Remount /bin, /root, and /home while adding the appropriate permissions.
 /bin /bin bind bind,nodev,ro
 /etc /etc bind bind,nodev,nosuid
 /home /home bind bind,nodev,nosuid
 /root /root bind bind,nodev,nosuid
 /var /var bind bind,nodev,nosuid
 
 none /proc proc nosuid
-none /dev/pts devpts noexec,nosuid,ro
 none /tmp tmp nodev,nosuid

Kernel/CMakeLists.txt

@@ -47,6 +47,7 @@ set(KERNEL_SOURCES
  DoubleBuffer.cpp
  FileSystem/BlockBasedFileSystem.cpp
  FileSystem/Custody.cpp
+ FileSystem/DevFS.cpp
  FileSystem/DevPtsFS.cpp
  FileSystem/Ext2FileSystem.cpp
  FileSystem/FIFO.cpp