Also update alire.toml to allow a successful self-build

* Full update of msys2 after first install

* Update msys installer to the latest stable release

* Bump version for 1.1 release

* Switch index branch to stable-1.1

* Update CLIC to v0.1.1

* Alr.Commands: use CLIC.TTY selection/detection of Is_TTY for the Trace package

* New On_Demand action for future-proofing

* Test for on-demand actions

* Don't present incompatible tools in the assistant

* Sort gnats by version in the assistant

Rather than by name

* Detect origin conflicts in `alr toolchain --select <>`

* Use already configured tool origin as filter

* New test for checks on --select <releases>

* Self-review tweaks

Rather than by name

Merge changes since rc2 into 1.1 branch for rc3

* Alr.Commands.Toolchain: tweak for multiple components and install dir

This patch adds support of multiple components and allow
--disable-assistant with all commands so that it is possible to
configure all the toolchain stuff in one command:
$ alr toolchain --select gnat_native gprbuild --disable-assistant

The patch also introduces a --install-dir switch to allow installation
in any directory. This can be useful for people willing to use the Alire
toolchain outside of an Alire workflow. It would be better if the root
dir of the archive (e.g. gprbuild_21.0.0_349f6f95) was skipped so that
all the tools would be available from <INSTALL_DIR>/bin/.

* tests: increase gnat_native version in fixture index and add more tests

* Alr.Commands.Toolchain: print list only when no command is specified

* tests/toolchain/custom_install_dir: fix paths for Windows and second dir

* Fix PR comments

Fix #823

This way changing it does not require recompiling absolutely everything.

* Extract sub-command handling (alr <command>)

The goal of this big refactoring is to extract the handling of
sub-commands to make it available for other projects.

The SubCommander packages (name open to changes) can be extracted to a
dedicated crate or to AAA.

There is at least one regression which is the support of -X for alr
build.

* Alr.Commands.Toolchain: Fix comparison typo from refactoring

* Alr.Commands|SubCommander: Fix exception raise and handling

* Typo

* Address review comments and minor changes

* Another big refactoring on command line handling

The switches are not parsed several times like before.  The global
switches parsing is done once, the command specific switch parsing is
done only on the command arguments.

Handling of -X scenario variable switches is now done with regular
GNAT.Command_Line switch handling.

There is a issue with command arguments that contain spaces, it looks
like they are split in multiple arguments. I don't know why.

* Fix args filtering

The concatenation of arguments and re-splitting with
GNAT.OS_Lib.Argument_String_To_List breaks when arguments have
whitespaces: 'alr' 'show' 'a b c' becomes 'alr 'show' 'a' 'b' 'c'.

* Wrap the GNAT Commnand_Line_Configuration to add required features

This was previously done with a GNAT.Command_Line.Extra package that
exploited the internals of GNAT.Command_Line.

This is more portable because less exposed to changes in the internals
of GNAT.Command_Line.

* Rename SubCommander to CLIC.Subcommander and move it to alire/

* Move Alire.Utils.User_Input and Alire.Utils.TTY to CLIC

* Alr.Platforms.Windows: Fix builds

* Import CLIC as submodule

* Bump aaa to latest version

* Provide a safe traversal proc for dependencies

Migrate deployment of releases to this call

With this addition users only have to worry about the version in
alire.toml and it will be propagated to code and gpr files.

* Allow to select toolchain non-interactively

* Enhance toolchain selection test

Now we test the non-interactive selection, and the local selection

* Make `alr index` default to `--list`

* list indexes with same header format as elsewhere

This is done so when a regular compiler from Alire is put in the path, it won't
be doubly available as a regular release and as an external release, which may
be confusing.

* Implement `alr toolchain --disable-assistant`

* Disable the assistant in testsuite using new swithc

* Clean temporaries in config cache too

* Show size of freed temporary files

* Track and delete temp files on Ctrl-C

* CI fix

* Ensure all paths are absolute

* Lockfile silently migrated to $crate/alire

* testsuite: new test for the silent migration

* testsuite: fixes for existing tests

* user-changes.md: document the new lock location