Kernel: Changed stat values from func to be field

- Removed virtual functions for all of the stat stuff.
This did however introduce some issues, mainly with /proc
becoming out of sync if you changed your ID. I propose we
do the linux thing and just have a stat update function
which is optional, but allows dynamic updates of stat fields
for cases such as those in uid/gid in /proc.
- Simplified the API, although still kind of annoying
it is a bit simpler.
- Moved some of the FS structure from having the FS inode inside
the in memory inode to a Serialise <-> Deserialise model where
Inodes are deserialised from disk into in memory ones and then
back into on disk ones when it comes time for syncing.
This makes it semantically better in my opinion, as it explicitly
separates disk and non-disk functionality.

kernel/include/kernel/USB/MassStorage/SCSIDevice.h

@@ -15,7 +15,6 @@ namespace Kernel
 		uint32_t sector_size() const override { return m_block_size; }
 		uint64_t total_size() const override { return m_block_size * m_block_count; }
 
-		dev_t rdev() const override { return m_rdev; }
 		BAN::StringView name() const override { return m_name; }
 
 	private:
@@ -34,7 +33,6 @@ namespace Kernel
 		const uint64_t m_block_count;
 		const uint32_t m_block_size;
 
-		const dev_t m_rdev;
 		const char m_name[4];
 
 		friend class BAN::RefPtr<USBSCSIDevice>;