Pull args, intl, logging, shelf, and source_maps out of the SDK.

pkg/intl/CHANGELOG.md

-## 0.11.12
-  * Number formatting now accepts "int-like" inputs that don't have to
-    conform to the num interface. In particular, you can now pass an Int64
-    from the fixnum package and format it. In addition, this no longer
-    multiplies the result, so it won't lose precision on a few additional
-    cases in JS.
-
-## 0.11.11
-  * Add a -no-embedded-plurals flag to reject plurals and genders that
-    have either leading or trailing text around them. This follows the
-    ICU recommendation that a plural or gender should contain the
-    entire phrase/sentence, not just part of it.
-
-## 0.11.10
-  * Fix some style glitches with naming. The only publicly visible one
-    is DateFormat.parseUtc, but the parseUTC variant is still retained
-    for backward-compatibility.
-
-  * Provide a better error message when generating translated versions
-    and the name of a variable substitution in the message doesn't
-    match the name in the translation.
-
-## 0.11.9
-  * Fix bug with per-mille parsing (only divided by 100, not 1000)
-  
-  * Support percent and per-mille formats with both positive and negative
-    variations. Previously would throw an exception for too many modifiers.
-
-## 0.11.8
-
-  * Support NumberFormats with two different grouping sizes, e.g.
-    1,23,45,67,890
-
-## 0.11.7
-  * Moved petitparser into a regular dependency so pub run works.
-
-  * Improved code layout of the package.
-
-  * Added a DateFormat.parseStrict method that rejects DateTimes with invalid
-    values and requires it to be the whole string.
-
-## 0.11.6
-
-  * Catch analyzer errors and do not generate messages for that file. Previously
-    this would stop the message extraction on syntax errors and not give error
-    messages as good as the compiler would produce. Just let the compiler do it.
-
-## 0.11.5
-
- * Change to work with both petitparser 1.1.x and 1.2.x versions.
-
-## 0.11.4
-
- * Broaden the pubspec constraints to allow current analyzer versions.
-
-## 0.11.3
-
- * Add a --[no]-use-deferred-loading flag to generate_from_arb.dart and
-   generally make the deferred loading of message libraries optional.
-
-## 0.11.2
-
- * Missed canonicalization of locales in one place in message library generation.
-
- * Added a simple debug script for message_extraction_test.
-
-## 0.11.1
-
- * Negative numbers were being parsed as positive.
-
-## 0.11.0
-
- * Switch the message format from a custom JSON format to
-   the ARB format ( https://code.google.com/p/arb/ )
-
-## 0.10.0
-
- * Make message catalogs use deferred loading.
-
- * Update CLDR Data to version 25 for dates and numbers.
-
- * Update analyzer dependency to allow later versions.
-
- * Adds workaround for flakiness in DateTime creation, removes debugging code
-   associated with that.
-
-## 0.9.9
-
-* Add NumberFormat.parse()
-
-* Allow NumberFormat constructor to take an optional currency name/symbol, so
-  you can format for a particular locale without it dictating the currency, and
-  also supply the currency symbols which we don't have yet.
-
-* Canonicalize locales more consistently, avoiding a number of problems if you
-  use a non-canonical form.
-
-* For locales whose length is longer than 6 change "-" to "_" in position 3 when
-  canonicalizing. Previously anything of length > 6 was left completely alone.
-
-## 0.9.8
-
-* Add a "meaning" optional parameter for Intl.message to distinguish between
-  two messages with identical text.
-
-* Handle two different messages with the same text.
-
-* Allow complex string literals in arguments (e.g. multi-line)