* cli/gcdmodel.cpp: Fix typos in comments.

* cli/gcdmodel.cpp (CGcdData::fixModelAndSubmodelOrder): Fix typos in comments.

* cli: Support "max" as an alias to the maximum value for the order switch.

* cli/cmdline.cpp (parseArg): Understand "all" for the order switch.
(showUsage): Document it.
* cli/gcdmodel.cpp (CGcdData::fixModelAndSubmodelOrder): Ensure the
root model order gets recomputed when "/o:max" was provided as argument.
* cli/model.h (UNDEFINED_ORDER): Redefine as the minimum int value.
(MAXIMUM_ORDER): New constant.
* doc/pict.md: Document it.
* test/arg/.tests: Add test.

Co-authored-by: Maxim Cournoyer <maxim.cournoyer@savoirfairelinux.com>

* Use "L" notation for wide character

* Remove unneeded cast

PrintMessage() now uses const pointer

* C++11 accepts std::string for std::wifstream

* C++11 accepts std::string for std::wifstream

* Use mbstowcs()/wcstombs() to convert character class

This fix works when file path includes non-ASCII characters.

* Revert "Use mbstowcs()/wcstombs() to convert character class"

This reverts commit 7fd150a1570b8d6de246da352688daaeadcda998.

mbstowcs()/wcstombs() is not so secure, and recommends mbstowcs_s()/wcstombs_s().
But these secure variants are not supported by some C libraries.

* Fix warning about the array delete

* Fix ErrorCode enum

* Fixing unintalized vars

* Fix warnings pertaining to EncodingType.

* More fixes to enum related warnings

* Enable warnings

* Work without "-fpermissive" option

* Cosmetic fix

* Add "const" to fix warnings

These strings are not needs to modify.

* No need to use "#pragma once" in main C++ source file

* Cosmetic fix

Add newline to end

* Return nullptr if error

* delete() not works for "void*"

Cast specific type to use delete()

* Disable VC++ specific pragmas for other C++ compilers

* Fix warning

* Fix warning

* Use pipeline for compiler

* Enable code optimization

* Add "default:" to fix "switch" syntax warning

* Use "nullptr" for null pointer

* Use nullptr instead of NULL

* Use nullptr instead of NULL

* Use "L" notation for wide character

* Use C++ header instead of raw C header

Several classes and functions were not const-correct. Did the minimal changes
to fix compilation, although there are other const fixes that can be done.