Modify copyFiles to allow recursive copying of directories with contents, if directory name is specified in file list (or matched by wildcard)

Implement copyDirs parameter, similar to copyFiles - should recursively copy directory content to destination

faster determinePlatform ...

- 310ms -> 7ms

- don't link dub_platform_probe

- avoid phobos imports in the probe file

Merge pull request #380 from Geod24/ct-platform-probe ...

Make the platform probe the file at CT, hence allow it to work for cross-compilation.

Make the platform probe the file at CT, hence allow it to work for X compilation

Invoke the binary for linking, not the name

Fix output flags for compilers != dmd

Added singleFile support

Make prepareBuildSettings, extractBuildOptions and setTarget const

Use executeShell() to invoke the compiler. See #356. ...

execute() doesn't support running scripts with shebang lines. Still needs to be actually tested with a script on Linux/OS X.

Put BuildSettings into its own module and invoke DMD to determine the actual build platform. ...

Currently only for DMD, the build platform is now determined by actually invoking the compiler with the proper -mX switches instead of guessing from the compiler run that was used to build DUB.

Output -l flags on the compiler command line after all source files. Fixes #281.

Merge branch 'dustmite'

Add -defaultlib=x to the flags that need to be passed to the separate linking stage for DMD.

Add support for execution result callbacks in the build generator.

Fix version(Linux) -> version(linux) - gotta love inconsistent naming...

Use --no-as-needed only in Linux (OSX's LLVM based tool chain doesn't support it).

Add --no-as-needed to avoid linker errors with new GCC versions used as the linker front end. See #199.

Put linker flags (including "libs") after linker "sourceFiles". See #199. ...

Supposedly fixes an issue where a dependency that was build as a static library cannot access symbols of an external library that it needs, because the external library is passed to the linker before the dependency itself.

Rename BuildOptions.noBoundsChecks to noBoundsCheck to be consistent with BuildRequirements.requireBoundsCheck.

Rename some BuildOptions to avoid D keywords.

Don't emit -fPIC for DMD on Windows. Fixes #166.

Remove dub.internal.std.process compatibility code as it doesn't support browse() and the compile status on older DMD versions isn't tracked anyway.

Issue -shared and -fPIC when building shared libraries with DMD. Fixes #138.

Fix handling of lib flags on Windows for GDC/LDC.

Move dub.utils to dub.internal.utils and update copyright dates.

Let the individual compiler classes handle passing arguments to the compiler. Fixes #86.

Add -shared flag for DMD when building dynamic libraries.

Generalize common compiler switches in the form of a BuildOptions enum. ...

Related changes:
 - translation of DMD compiler switches to other compilers is generalized
 - application of build requirements is generalized
 - added support for debug versions
 - supporting almost all compiler settings for generated VisualD projects now

Improve adherence to code conventions.