PackageManager: Move the scanning logic to Location, segment per Location ...

Before this change, all packages were surprisingly stored in m_internal.localPackages,
which itself is a new addition to replace an array of 'Package'.
This means that even though we had an architecture that looks like it segmented
things per repository / location, it actually didn't,
and things worked solely based on the order packages were added it
(and the fact we did a linear search).

PackageManager.Location: Split packages registered locally and read from path ...

A Location, having a default search path (the package path),
and some extra search path, optionally, previously stored
all of them in the same array. However, this creates problems,
as we want to move to lazy load the packages in the default
search path, while we can't lazy load packages in non-default ones.

Trivial: Fix some style issues

PackageManager: Simplify logic around refreshing packages ...

Passing an empty array will lead to the same behavior
as using a boolean, so we can remove the parameter.

Trivial: Rename refresh_existing_packages parameter to refresh

Dub: Use UpgradeOptions.dryRun instead of printUpgradesOnly ...

The latter is said to be deprecated, and this is the only usage.

Merge pull request #2463 from Geod24/docs ...

Trivial: Improve documentation, reduce noise around loading local package

Signed-off-by: Jan Jurzitza <gh@webfreak.org>
Merged-on-behalf-of: Jan Jurzitza <gh@webfreak.org>

Trivial: Reduce noise and allocation while reading local-packages.json

Trivial: Improve dub.packagemanager : Location documentation

Deprecate overrides: local-overrides.json, add-override, remove-override ...

As explained in the changelog, overrides were a solution to a system
with version-only dependencies, which is long gone.

Trivial: Improve 'dub list' description

Project: Only print warning about mismatching dependency specs for versions ...

When using path-based dependency or repository dependencies,
we shouldn't need to validate those as they always match.

Merge pull request #2458 from Geod24/segment-location ...

PackageManager: Move scanPackageFolder to Location

Signed-off-by: Nicholas Wilson <thewilsonator@users.noreply.github.com>
Signed-off-by: Razvan Nitu <RazvanN7@users.noreply.github.com>
Merged-on-behalf-of: Mathias LANG <pro.mathias.lang@gmail.com>

PackageManager: Move scanPackageFolder to Location ...

A simple move for now to keep it simple,
the breach of abstraction will be resolved in a latter commit.

PackageManager.scanPackageFolder: Do some cosmetic fixes

Fix #2450 - issue1474 testcase is broken on Windows

Merge pull request #2453 from tom-tan/issue2452 ...

Fixes #2452 - Accept non-existing file in `sourceFiles`

Signed-off-by: Nicholas Wilson <thewilsonator@users.noreply.github.com>
Merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Add test

Fixes #2452 - Accept non-existing file in `sourceFiles`

Merge pull request #2449 from tom-tan/issue2448 ...

Fixes #2448 - Accept sourceFiles without module declaration 

Signed-off-by: Nicholas Wilson <thewilsonator@users.noreply.github.com>
Merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Add test

fixes #2448 - Accept sourceFiles without module declaration

Posix: Add default SONAME/install_name for dynamic libraries ...

Setting it to the filename (ELF) or `@rpath/<file name>` (Mach-O).

This seems to be required in order to use the libraries copied to
the output directory of dependees - either by setting the
LD_LIBRARY_PATH env var when starting the executable, or baking a
RUNPATH into the executable (e.g., via `patchelf --set-rpath` for
deployment).

Otherwise the loader tries to load the library from the original
location specified in the linking cmdline, which is some
`<path to dep pkg>/.dub/…` path (and apparently potentially
relative, and thus even more brittle). For ELF, I would assume
that all SONAME + DT_NEEDED entries (of executable + all .so libs)
would need to be post-processed to enable loading the libs from the
executable's directory (well, any non-original location).

update version to v1.29.2-beta.1

Temporarily disable ldc-master as the dustmite test is broken

CI: Update versions of dub for fetch test ...

Those versions are old and broken with the latest compiler,
hence dub run will fail. Use the three most recent versions
(at the time of writing) to solve this issue.

PackageManager: Move class' extra searchPath/Package to an internal location ...

Those fields have been aggregated in Location and them being in `PackageManager`
stands out as a double duty (the `PackageManager` is both a `Location`
and act as a `Location` manager). By using a `Location` for them we can
start to streamline the code.

Use configy library to parse dub.json file ...

This will provide a vastly superior UX to the users:
- They will be warned about typos;
- The type information provided will be more accurate and always include file/line infos
  (e.g. no more 'Invalid SemVer versions');
- We can expose a better recipe struct to library users on the long run,
  by separating the actual data DUB uses from what it reads;
- We can be more descriptive about errors / intent, for example by using `SetInfo`;

Trivial: Convert some spaces to tabs

Trivial: Remove always-true condition ...

isExactVersion will never return true if repository.empty returns false.