feat: redesign installer on MTK toolkit with component selection

Rewrite the Installer app on the Montauk Toolkit (Canvas + gui/mtk
widgets, theme, hover states, scrollbar) replacing the hand-rolled px_*
renderer and bespoke TrueType usage.

Add a new "Software" step: an expandable checkbox tree for optional
components (Montauk SDK with gcc/g++, binutils, tcc, lua sub-items;
Games; Office; Internet apps; Printing; experimental httpd and SDR).
Unchecked components' paths are excluded from the install copy, with a
longest-path ownership rule so e.g. sdk/tcc installs even when the rest
of the SDK is deselected. The update flow refreshes only the components
the target already has.

Add tri-state checkbox and disclosure-arrow widgets to the MTK toolkit
(anti-aliased, supersampled).

Merge tcc and lua into 0:/sdk (0:/sdk/tcc, 0:/sdk/lua) and drop 0:/lib:
update tcc config.h, lua luaconf.h, both Makefiles, the devkit clean
scope, man pages and montaukos.org notices.

Make printing optional: init skips printd when 0:/os/printd.elf is
absent.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

montaukos.org/docs/man/legal.html

@@ -153,9 +153,9 @@
     * Roboto font, Copyright The Roboto Project Authors - OFL-1.1
     * C059 font (URW Base 35), Copyright (C) (URW)++ Design and Development
       GmbH - AGPLv3 with font-embedding exception
-    * Tiny C Compiler (tcc.elf, 0:/lib/tcc), Copyright (c) Fabrice Bellard and
+    * Tiny C Compiler (tcc.elf, 0:/sdk/tcc), Copyright (c) Fabrice Bellard and
       contributors - LGPL-2.1
-    * Lua (lua.elf, 0:/lib/lua), Copyright (C) Lua.org, PUC-Rio - MIT
+    * Lua (lua.elf, 0:/sdk/lua), Copyright (C) Lua.org, PUC-Rio - MIT
     * Mozilla CA certificate bundle (0:/os/certs), Mozilla CA Certificate
       Program - MPL-2.0
     * Intel Bluetooth firmware (0:/os/firmware/intel), Copyright (c) Intel