Fix vibe.d compatibility for vibe.d < 0.8.0.

Improve vibe.d compatibility. ...

If another package links against a vibe.d sub package instead of the base package, this now properly uses the vibe.d types instead of DUB's internal forks.

Fix compilation errors in the "library" configuration.

Add file/line to JSON parser error messages. Fixes #957.

Remove POSIX special-casing from copyFile ...

Since `std.file.copy` provides a means to preserve attributes of a file
as of DMD 2.067.0 or later, it is preferable to use this option rather
than having a custom-written solution.  `version (Posix)` special-casing
is therefore used only where the DMD version does not support it.

Note that where the `version (Posix)` code uses a `chown` call followed
by a `chmod` call, `std.file.copy` only uses a `chmod`.  This is not
expected to cause any issues but should be borne in mind as a possible
breaking change for some use-cases.

Fixes https://github.com/dlang/dub/issues/992.

Fix deprecation warnings in sdlang-d. See #945. ...

Backport from official sdlang-d repository.

trivial: Fix typos

Merge pull request #891 from MartinNowak/dmd_nightly ...

test with dmd-nightly and dmd-beta

Handle unbound stdout/stderr gracefully. See #892.

fix ambiguous isNumeric overload ...

- isNumeric!string matches std.string.isNumeric and std.traits.isNumeric

Eliminate use of Json.opDispatch. ...

(cherry picked from commit bf65c40)

Check return value of rawRead().

Use std.stdio instead of the deprecated std.stream. ...

Since opening non-ASCII filenames on Windows is fixed for the latest DMD version, it now only has to be made sure to use a recent compiler to build DUB.

Add assertion message.

Remove usage of Comma expression

Remove some trailing whitespace

Review fixes.

Review and document dub.project. ...

Also lowers "--(string-)import-paths" to "--data=x --data-list".

Review and document module dub.dub. ...

Moves the module name determination code to dub.internal.utils and makes DependencyVersionResolver private, as that will probably change considerably in the future (no deprecation path for this, because it's unlikely to be used outside out DUB).

Deprecates Dub.list(String)ImportPaths, as these functions are fundamentally flawed, because they are taking just a subset of the possible fields in GeneratorSettings. listProjectData is the designated successor.

Fix compilation on DMD 2.066.1.

Fix all deprecation warnings on 2.071.0-b1, except for std.stream. ...

std.stream is still needed to support UTF filenames.

Fix lexing of empty string literals (Abscissa/SDLang-D#34).

Add compatibility code for DMD <= 2.065

Upgrade to SDLang-D 0.9.4.

Compiler fix on latest DMD beta.

Merge pull request #702 from MartinNowak/ddox_tool ...

allow to specify ddox tool

Remove unused code that throws a warning on DMD 2.069.0-b2.

allow to specify ddox tool ...

- can be used to customize the ddox tool (and it's output)
- assumes similar commands/behavior

fix #674 - cache needs to be locked for concurrent dub runs ...

- implement lockFile/tryLockFile using mkdir
- use lockFile to synchronize package download

Implement atomicWriteJsonFile. ...

Writes to a temp file and then replaces (delete+rename) the target file, so that it always contains complete and valid contents.