Get rid of deprecate warnings

[ryuukk]

Deprecate warnings should fixed before they become errors:

source\dub\dependency.d(917,18): Deprecation: scope variable `this` assigned to non-scope parameter `oth` calling `opEquals`
source\dub\dependency.d(920,30): Deprecation: scope variable `this` assigned to non-scope parameter `a` calling `doCmp`
source\dub\dependency.d(921,27): Deprecation: scope variable `this` assigned to non-scope parameter `b` calling `doCmp`
source\dub\dependency.d(939,26): Deprecation: scope variable `this` assigned to non-scope parameter `oth` calling `opEquals`
source\dub\internal\configy\Exceptions.d(130,34): Deprecation: reference to local variable `buffer` assigned to non-scope anonymous parameter
source\dub\internal\configy\Exceptions.d(134,34): Deprecation: reference to local variable `buffer` assigned to non-scope anonymous parameter
source\dub\internal\configy\Exceptions.d(248,27): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(250,27): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(283,27): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(286,27): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(323,31): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(325,31): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(332,31): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`
source\dub\internal\configy\Exceptions.d(335,31): Deprecation: `@safe` function `formatMessage` calling `formattedWrite`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\write.d(537,34):        which calls `std.format.spec.FormatSpec!char.FormatSpec.writeUpToNextSpec!(void delegate(in char[]) @safe).writeUpToNextSpec`
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        which would be `@system` because of:
C:\D\dmd2\windows\bin\..\..\src\phobos\std\format\spec.d(258,33):        scope variable `this` assigned to non-scope parameter `e` calling `put`

[WebFreak001]

these deprecations won't turn into warnings if -preview=in gets enabled before that, because with that enabled, all except one deprecations are gone.

Will open a PR to add -preview=in to dflags (although I'm not a big fan of the preview switch as it isn't future-proof / breaks once the feature is actually added)

[Geod24]

This is now fixed for dub build. There are a few deprecations with dub test but I'll resolve those soon.