substitute commands in dub describe output

move command variable substitution to execution ...

This is needed as commands that need to be run need to have generator
settings available before running to avoid inconsistencies with
environment variables passed to the actually ran program and variables
used in substitution.

Fixes #2192

Fixes pre/postGenerateCommands inconsistently using dub environments
(execution was substituted including buildEnvironments, but shell cmd
did not get the build variables for substitution) - now both get
the build variables. Solved by removing code duplication. (env building)

This commit changes the behavior of `dub describe` so that describing
commands settings no longer substitutes variables. Before, known
variables would have been replaced in the output and on unknown
variables `dub describe` would fail with an error
`Target 'x' doesn't exist`

Now exposes some previously private project.d processVars functions

Removes dynamicLibrary being built as staticLibrary for targets other than OMF

Fix issue 2051 failing CI

fix CLI --print-builds implementation

add UnsupportedArchitecture/CompilerException ...

for API purposes to not match on string prefixes

Fix --data-list error message with dub describe (#2195) ...

It said you can also use --data-0, but that actually will not make it
work. You need to still specify --data-list and optionally add -data-0
to make it 0 separated instead of line separated.

Windows: Copy .pdb files ...

Fixes #1962.

Fix build setting inheritance ...

First inherit upward then force the dependency build settings
downwards. Fixes the dependency build settings leaking upwards.

Fixes #2176
Fixes #2177

Expand tilde in --root path

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

update version to v1.27.0

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

update version to v1.27.0-rc.1

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

update version to v1.27.0-beta.3

Put dustmite flags just after dustmite command and add --trace flag

Forward dub dustmite parameter -j

Forward dub dustmite parameter --strategy

fix Issue 1645: the DFLAGS env variable is not handled when --build is passed

update version to v1.27.0-beta.2

Qualify `toType`-parameter `o` as `scope return`

Fix errors of the form "Error: scope variable o assigned to non-scope parameter `o` calling dub.internal.undead.xml.toType!(const(Item)).toType" blocking dlang/dub#2164 ...

Also see https://github.com/dlang/undeaD/pull/47.

Replace deprecated keyword `body` with `do`

update version to v1.27.0-beta.1

Merge pull request #2156 from denizzzka/download_url_method_2 ...

RegistryPackageSupplier.genPackageDownloadUrl added

Remove line 'Excluding package.d blah...' from default dub build

Fix #2141 - When used as a library, the default compiler is different from the expected. (#2158)

RegistryPackageSupplier.genPackageDownloadUrl added

update version to v1.26.1