refactor: namespace restructure of entire codebase

Reorganize all source files into a hierarchical namespace structure
with dot-separated unit names matching directory paths.

Major changes:
- src/prog/ -> src/app/ (app.*.pas)
- src/fault/ -> src/arch/x86/fault/ (arch.x86.fault.*.pas)
- src/isr/ -> src/arch/x86/isr/ (arch.x86.isr.*.pas)
- src/include/ -> src/core/ (core.*.pas) + src/arch/x86/
- src/driver/ subtree reorganized with driver.* namespace prefixes
- src/driver/storage/con/ -> src/driver/storage/ctl/ (Windows reserved name fix)
- src/driver/storage/ split into con(ctl)/fs/vol/ subdirectories
- src/driver/net/ flattened from l1-l5 layers to driver.net.*.pas
- kernel.pas -> asuro.pas, faults.pas -> arch.x86.faults.pas
- stdio.pas/syslog.pas -> io/io.stdio.pas, io/io.syslog.pas
- processmanager.pas -> proc/proc.mgr.pas
- lmemorymanager.pas -> memory/memory.heap.pas
- Build scripts moved to toolchain/
- Added compat/ shims for lmemorymanager and types
- Added doc/namespace.md tracking the refactor

197 files changed, 6292 insertions(+), 5526 deletions(-)

src/driver/storage/ctl/driver.storage.ctl.usb.pas

@@ -0,0 +1,88 @@
+//  Copyright 2021 Aaron Hance
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+{
+    Driver->Bus->driver.bus.usb->USB_Storage - driver.bus.usb Mass Storage Class Driver (stub).
+
+    Registers with driver.mgr as a driver.bus.usb class driver matching
+    mass storage devices (class $08, subclass $06 SCSI, protocol $50 BBB).
+    Currently a skeleton that recognises the device but performs no I/O —
+    full Bulk-Only Transport support is planned.
+
+    @author(Aaron Hance <[email protected]>)
+}
+unit driver.storage.ctl.usb;
+
+interface
+
+uses
+    driver.mgr,
+    memory.heap,
+    driver.storage.types,
+    io.syslog,
+    debug.tracer,
+    driver.bus.usb.core,
+    driver.bus.usb.types,
+    core.util, arch.x86.util;
+
+procedure init;
+
+implementation
+
+{ ========================= Constants ========================= }
+
+const
+    USB_CLASS_MASS_STORAGE = $08;
+    USB_SC_SCSI            = $06;   { SCSI transparent command set }
+    USB_PROTO_BBB          = $50;   { Bulk-Only (BBB) transport }
+
+{ ========================= Class driver callback ========================= }
+
+{ Called by driver.mgr when a mass-storage interface is matched.
+  For now we just log it. }
+function load(ptr : void) : boolean;
+begin
+    push_trace('driver.storage.ctl.usb.load');
+    io.syslog.logln('driver.bus.usb-Storage', 'Mass-storage device detected (stub - no I/O yet).');
+
+    { TODO: read Max LUN, set up Bulk-Only endpoints, register with
+      driver.storage.mgr via driver.storage.mgr.register_device. }
+
+    load := true;
+    pop_trace;
+end;
+
+{ ========================= Init ========================= }
+
+procedure init;
+var
+    MSID : TDeviceIdentifier;
+begin
+    push_trace('driver.storage.ctl.usb.init');
+    io.syslog.logln('driver.bus.usb-Storage', 'INIT BEGIN.');
+
+    MSID.Bus := biUSB;
+    MSID.id0 := idANY;                { Any VID:PID }
+    MSID.id1 := $FFFFFFFF;            { Any device class }
+    MSID.id2 := USB_CLASS_MASS_STORAGE;{ bInterfaceClass = $08 }
+    MSID.id3 := USB_SC_SCSI;          { bInterfaceSubClass = $06 }
+    MSID.id4 := USB_PROTO_BBB;        { bInterfaceProtocol = $50 }
+    MSID.ex  := nil;
+
+    driver.mgr.register_driver('driver.bus.usb Storage Driver', @MSID, @load);
+
+    io.syslog.logln('driver.bus.usb-Storage', 'INIT END.');
+    pop_trace;
+end;
+
+end.