Posix: use /etc/dub/settings.json if in /usr ...

Fix #1472

/etc/dub/settings.json overrides /usr/etc/dub/settings.json (as
suggested by the `man hier` manpage)

Fix issue 2051 failing CI

Remove line 'Excluding package.d blah...' from default dub build

Fix #2141 - When used as a library, the default compiler is different from the expected. (#2158)

Add environment variables to BuildSettings (#2121)

only show package.d warning once

Merge remote-tracking branch 'upstream/stable' into merge_stable

fixed a bug with DFLAGS environment variable and cached generated unittest

Add lowmem for settings

Add the main source file directory to import paths ...

else dub doesn't find it because the single file package do not have the default package directory structure

In single file packages the main source file shouldn't be ignored ...

because it represents all package by definition

Trivial: Clean up trailing whitespace

Trivial: Remove redundant import ...

This is already imported at module scope.

Improved ldc cross compile: ...

The folder `.dub/obj` has been moved to `.dub/build-*/obj` for an independent cross / parallel build process.
Now it is possible that two processes can build the same project with different configurations.

Fix #2051 "Running unittests from dub single file packages fails" (#2052) ...

Performing test command dub imports every source file as module to build the project excluding the main source file. But this excluding may fail and in this case dub try to import the main source file as module. Single file package building fails because the main source file does not belong to any import path. Now both the current file and the main source file paths are compared in relative form to prevent importing the main source file as module.

Use DC env variable as the default compiler

Minor: Remove superfluous if in Dub constructor ...

getPackageSuppliers already handles SkipPackageSuppliers.none correctly,
no need for an extra check.

cache the generated test main file: dub_test_root.d ...

these changes prevent dub from rebuilding a project every time it runs a unittest.

merge stable (#2014) ...

* Fix bogus warning for non-path based dependencies.

Introduced by #1974.

* update version to v1.23.0-rc.1

Co-authored-by: Sönke Ludwig <sludwig@outerproduct.org>

dub_test_root: remove commented code ...

Signed-off-by: Luís Ferreira <contact@lsferreira.net>

Make 'dub remove' remove all packages by default in non-interactive mode ...

Given how often it is used in the test-suite, it should be self-obvious
that it will be what most users want.

Support dependencies as git url with exact commit (#1798) ...

* Support dependencies as git url with exact commit

* Compare hashes for SCM

Fix bogus error message for the path used to reference sub packages. ...

Sub packages should ("must") always be referenced through the path of their base package instead of their own path (in case it differs). However, the dependency resolution code assume the opposite. Both way are now accepted, but referencing the sub package path directly results in a warning.

Default registry: add Skoppe's, remove Herokuapp

Merge pull request #1887 from dlang/add_codemirror ...

Add codemirror.dlang.org as the primary fallback registry.

Add codemirror.dlang.org as the primary fallback registry.

Clean up PackageManager handling of search path ...

The PackageManager is a complicated beast:
it is responsible for handling the local caches where downloaded
packages are stored, including looking up a specific version of a specific package.

One feature that stood out while going over the code was the ability to disable
the default search path.
After looking up inside of Dub more, it turns out that this feature is exclusively
used when dub is called with the '--bare' option.

However, when this happen, a special constructor of the Dub class is called,
one that calls the 'PackageManager' constructor with 3 dummy arguments,
and rely on a boolean being set to avoid those 3 dummy arguments having any effect.
This ends up with effectively providing the ability to toggle the ability to
search default search paths in theory, but in practice the dummy arguments
means that it wouldn't work, nor is it actually needed.

Instead, a special argument for the single-search path approach is provided now.
In order not to break library users, the public symbols have been deprecated,
but their usage still works.
Note that some symbols are deeply entangled: for example, 'Dub.m_overrideSearchPath'
being non-empty means that 'PackageManager.m_disableDefaultSearchPaths' is 'true'.
It also means that 'PackageManager.m_repositories' is unused (and can be empty).
Hopefully removing the ability to toggle the default search path will allow
us to simplify things and make 'PackageManager.m_repositories' the only way
to specify whether or not the default packages search path are used.

Note that additionally to the changes aiming to deprecate 'Dub.m_overrideSearchPath'
and 'PackageManager.m_disableDefaultSearchPath', an unused constructor of PackageManager
has been deprecated.

Merge pull request #1838 from Geod24/cleanup ...

Windows: Remove Roaming repository migration
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Remove traces of VibeCustomMain ...

VibeCustomMain support was removed in Vibe.d v0.7.0,
released over 4 years ago (2015-11-04).

Windows: Remove Roaming repository migration ...

This feature has been implemented in Dub v1.8.0, almost 2 years ago.