pkgman: fix for syntax (help)

The tool "pkgman" was not showing it's help text
and this seems to be somehow related to the
initialization of constants such as
"kCommandCategoryPackages"; these values seems to
be coming through as empty-string for some reason.
I am changing those to be "#define" of regular
C-Strings and this seems to resolve the problem.
These values only seem to be used to group the
possible commands for production of the syntax or
help text - there do not seem to be any deeper
impacts beyond that functionality.

Change-Id: If9cd61462cd7f1f1b5ab2ece521bb3f00a1ba246
Reviewed-on: https://review.haiku-os.org/c/1139
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

pkgman: Organize commands by category

pkgman: C++-ify the command handling

There's now a Command class that must be derived and registered with
a CommandManager, all simplified by a REGISTER_COMMAND macro. That gets
rid of the print_command_usage_and_exit() function copy for every
command, moves the short usage texts to the command implementations,
and avoids any repetition of the command name. When implementing a new
command only a new source file needs to be created, nothing else needs
to be touched.

pkgman: Add "search" command

pkgman: Simplify and rename resolve-build-dependencies

* Now it only gets a package (info) file and a single list of
repository directories, optionally with priority, and resolves the
package's dependencies. The more complex two resolving steps it did
before can just as well be done by haikuporter, and this way the
command is more flexible.
* Rename to resolve-dependencies.
* Some TODOs still remain.

pkgman: Add command resolve-build-dependencies

This is a service command for haikuporter. It resolves the dependencies
for a package to be built and lists them, so that haikuporter can
prepare the build environment accordingly.

The implementation isn't quite finished yet. Currently the packages are
printed only with name and version, while it would probably be more
helpful to print the path of the package file. Also, the package itself
(respectively a dummy package) is printed as well.

* more work on the package kit, repositories can now be added and
refreshed


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40280 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added support for interactive decisions to package kit and pkgman


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40268 a95241bf-73f2-0310-859d-f6bbb57e9c96

* WIP-commit of the first parts of the package kit and the pkgman
(console-)tool


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40261 a95241bf-73f2-0310-859d-f6bbb57e9c96

pkgman: Organize commands by category

pkgman: C++-ify the command handling

There's now a Command class that must be derived and registered with
a CommandManager, all simplified by a REGISTER_COMMAND macro. That gets
rid of the print_command_usage_and_exit() function copy for every
command, moves the short usage texts to the command implementations,
and avoids any repetition of the command name. When implementing a new
command only a new source file needs to be created, nothing else needs
to be touched.

pkgman: Add "search" command

pkgman: Simplify and rename resolve-build-dependencies

* Now it only gets a package (info) file and a single list of
repository directories, optionally with priority, and resolves the
package's dependencies. The more complex two resolving steps it did
before can just as well be done by haikuporter, and this way the
command is more flexible.
* Rename to resolve-dependencies.
* Some TODOs still remain.

pkgman: Add command resolve-build-dependencies

This is a service command for haikuporter. It resolves the dependencies
for a package to be built and lists them, so that haikuporter can
prepare the build environment accordingly.

The implementation isn't quite finished yet. Currently the packages are
printed only with name and version, while it would probably be more
helpful to print the path of the package file. Also, the package itself
(respectively a dummy package) is printed as well.

* more work on the package kit, repositories can now be added and
refreshed


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40280 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added support for interactive decisions to package kit and pkgman


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40268 a95241bf-73f2-0310-859d-f6bbb57e9c96

* WIP-commit of the first parts of the package kit and the pkgman
(console-)tool


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40261 a95241bf-73f2-0310-859d-f6bbb57e9c96