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

fix MartinNowak's finding - wildcard copyDirs should be applied to directories only

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

Mention what to do with linkDependencies when building.

Add some more documentation in the Generator class.

Remove PackageManager argument from createProjectGenerator(). ...

The argument is also removed from all Generator sub classes.

Add basic documentation for the Generator class and improve method protection.

Remove obsolete field from BuildGenerator.

Merge branch '0.9.22' ...

Conflicts:
	source/dub/dub.d
	source/dub/generators/build.d
	source/dub/generators/generator.d
	source/dub/package_.d

Avoid exception in up-to-date check for non-existent source files and trigger rebuild instead.

Avoid '/', '\\' and ':' in build path when --compiler specifies a complex path. Fixes #412.

Merge pull request #381 from Geod24/ldc-support ...

Various small fixes

Various small fixes ...

- fix computeBuildID for --compiler=/my/path;
- dub compiled with ldc tried to invoke ldc as default binary instead of ldc2;
- dmd: Don't generate anything;
- gdc: Do not link, only generate an object;

In copyFiles, check if entry is glob before treating it as such

Improve warning message when --rdmd is used without a "mainSourceFile". ...

See also #396.

Added glob support to copyFiles

Fix trying to copy copyFiles where source==destination.

Step one of abstracting package description format

create symlinks instead of copying cached build files

Implement separate linking on gdc

Fix output flags for compilers != dmd

Added singleFile support

Add a --temp-build switch to force building in the TEMP folder. Fixes #294.

Only add platform flags for targets that generate an actual binary. Fixes #346.

Removed trailing whitespace

Converted line endings from CRLF to LF

Use "dub.json" instead of "package.json" in documentation

Fix isUpToDate for sub packages

Fix up-to-date check for intermediate dependencies. ...

In a dependency chain with static libraries b and c (a->b->c), changing something in c didn't trigger a rebuild of b, but only of c and a.

Display the compiler binary with invoking the compiler for separate compilation. See #326.