test cases for version filters ...

- tests all combinations of inferred, specified, and inherited version filters

put version filtering behind an experimental switch

infer unspecified version filters ...

- otherwise of little use as all dependencies need to have specified
  version filters before this can be used
- also version identifiers are fairly easy to grep for
- cache inferred version filters
- still allows explicit specification for packages that use version
  identifiers in mixins

add main source files to root executable earlier

Added experimental build settings to filter applicable version identifiers ...

Those settings allow to filter version identifiers and debug version identifiers
used during building a package. This can improve the build cache efficiency for
libraries that are used by multiple applications with different version
identifiers.

- only merge filters from source dependencies when the
  dependent has an explicit filter list as well

Merge pull request #1595 from Flying-Toast/patch-1 ...

fix unix executables gitignore
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

fix unix executables gitignore

Merge pull request #1582 from andre2007/feature_pre_post_run_command ...

Pre/post run commands added
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Merge pull request #1590 from andre2007/fix_issue_1136 ...

Fix temp copy files
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Merge pull request #1594 from Flying-Toast/update-gitignore ...

Ignore unix executables in generated .gitignore
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

remove unneeded /

gitignore unix executables

Merge pull request #1526 from andre2007/fix_issue_1524 ...

Late dependencies resolver
merged-on-behalf-of: Jan Jurzitza <gh@webfreak.org>

Merge pull request #1591 from andre2007/fix-retry-registry-search-packages ...

Retry download for registry search packages
merged-on-behalf-of: Petar Kirov <ZombineDev@users.noreply.github.com>

Retry download for registry search packages

Merge pull request #1481 from SimonN/issue1478-quote-xcopy ...

Fix #1478 - Quote paths passed to xcopy

Merge pull request #1588 from andre2007/fix_ddox_default_architecture ...

Use default architecture for ddox
merged-on-behalf-of: Petar Kirov <ZombineDev@users.noreply.github.com>

Fix temp copy files

Pre/post run commands added

Use default architecture for ddox

Fix #1478 - Quote paths passed to xcopy ...

On Windows, `cd` accepts unquoted paths, but for any calls to `xcopy`,
paths arguments must be double-quoted. This patch surrounds all paths
with double-quotes before passing them to `xcopy`.

This fixes #1478: On Wine (and presumably Windows XP), migrating the dub
package directory from dub 1.7 to dub 1.8/1.9 via `xcopy` failed an
enforce in dub (because `xcopy` quit with nonzero exit code) and thus
prevented even the most simple dub projects from being built.

D WYSIWYG strings (backtick-surrounded strings) allow all characters
unescaped, including double quotes and backslashes.

Merge pull request #1586 from MartinNowak/merge_stable ...

Merge remote-tracking branch 'upstream/stable' into merge_stable
merged-on-behalf-of: Petar Kirov <ZombineDev@users.noreply.github.com>

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

purge changelog

update version to v1.12.0

Maven upgrade dependency tree

Merge pull request #1585 from MartinNowak/merge_stable ...

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

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

update version to v1.12.0-rc.1

Merge pull request #1584 from MartinNowak/merge_stable ...

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