Add the ext/misc/sqlite3_stdio.c portability interface and incorporate it

into the CLI, sqldiff, and sqlite3_analyzer.  Enhance the CLI with the new
".www" dot-command and related options on .once and .output.

FossilOrigin-Name: f97f9944b829a49da12786f934da0a5ad51591afd6d8a19a4a0835f51bbdbff2

diff --cc manifest
index bb39343c9642e7ba48608da354891fbbbeb05cb9,7cdc9f8b96b344017d65800a0c7761bf961d07af..c147b4354a05a521cb8274fc2af1d2512c7544da
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Resolve\sa\sharmless\scompiler\swarning\sin\sQNX\sbuilds.
- D 2024-09-26T18:13:10.425
 -C Provide\sSQLITE_U8TEXT_ONLY\sand\sSQLITE_U8TEXT_STDIO\scompile-time\soptions\nto\sthe\ssqlite3_stdio.c\smodule.
 -D 2024-09-26T19:16:20.290
++C Add\sthe\sext/misc/sqlite3_stdio.c\sportability\sinterface\sand\sincorporate\sit\ninto\sthe\sCLI,\ssqldiff,\sand\ssqlite3_analyzer.\s\sEnhance\sthe\sCLI\swith\sthe\snew\n".www"\sdot-command\sand\srelated\soptions\son\s.once\sand\s.output.
++D 2024-09-26T19:38:34.453
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -768,8 -770,8 +770,8 @@@ F src/random.c 606b00941a1d7dd09c381d32
  F src/resolve.c 9750a281f7ba073b4e6da2be1a6c4071f5d841a7746c5fb3f70d6d793b6675ea
  F src/rowset.c 8432130e6c344b3401a8874c3cb49fefe6873fec593294de077afea2dce5ec97
  F src/select.c 4b14337a2742f0c0beeba490e9a05507e9b4b12184b9cd12773501d08d48e3fe
- F src/shell.c.in 9b68a945f3aafc78eac1a256a4a588a9310dbc61a0cd60378c5b7a78f789af50
+ F src/shell.c.in f82c16f090496e61d4b67500522dbbf8f1b37c77415aafc24a7c84bc9d0c8709
 -F src/sqlite.h.in 77f55bd1978a04a14db211732f0a609077cf60ba4ccf9baf39988f508945419c
 +F src/sqlite.h.in b20547021d20ba016c2fd0500f14f08a21ff23e64a0ed93e72ca0fecb9e1d0a0
  F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
  F src/sqlite3ext.h 3f046c04ea3595d6bfda99b781926b17e672fd6d27da2ba6d8d8fc39981dcb54
  F src/sqliteInt.h 5978cbb11becc3ce6471015d770d95f694ece06336c496f691df1b02460e9cd5
@@@ -2213,8 -2215,8 +2215,9 @@@ F vsixtest/vsixtest.tcl 6195aba1f12a5e1
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 92d71eee4f3a5edb3877c108d14972d80654982b0de3e635d9d008e9d3b6591f
- R 695a2a8c9ed9206bd31e5393e29d1395
- U stephan
- Z 46b5546a8d1e43d063c19803f97215ff
 -P 54c22bc6165affbea0d1166a0912d19939300ccc4ae33a6b2ed8c510ab61c574
 -R 2b2b12aba8675f6b1c9a607cabf2b89d
++P 2916460179c6089375188c6e4e3cff1fca5bbbbb7280a10c919e09e75d1f11f8 f31588520e3f45b50dcaa9eecab17f52ebb56bb53d0f9bdb88cc596d1a156353
++R f87c6f9c6a8b13e5a36fdc8ca3678f8e
++T +closed f31588520e3f45b50dcaa9eecab17f52ebb56bb53d0f9bdb88cc596d1a156353
+ U drh
 -Z a76d82025e5362f7f888a23f868f0cc8
++Z ae14ce22d9ca5329be6ced79481d3b29
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 24900fc1d3668987bcc38b014d19b4f664a75dd2,04b6c8d8cc6980f3f6da5afa7a171655a4eb139a..a71365e25828018c058cf771ddf570bbd6d98a86
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 2916460179c6089375188c6e4e3cff1fca5bbbbb7280a10c919e09e75d1f11f8
 -f31588520e3f45b50dcaa9eecab17f52ebb56bb53d0f9bdb88cc596d1a156353
++f97f9944b829a49da12786f934da0a5ad51591afd6d8a19a4a0835f51bbdbff2