Update ICU to 58.3

- This adds the new Japanese ascension era (Reiwa)
- This updates timezone data to 2019a
- Updated script for git instead of SVN
- Regenerated locale data

intl/icu/source/data/unidata/FractionalUCA.txt

@@ -1,4 +1,4 @@
-# Copyright (C) 2016 and later: Unicode, Inc. and others.
+# Copyright (C) 2016 and later: Unicode, Inc. and others.
 # License & terms of use: http://www.unicode.org/copyright.html
 # Fractional UCA Table, generated from the UCA DUCET
 # 2016-06-03

intl/icu/source/data/unidata/UCARules.txt

@@ -1,4 +1,4 @@
-# UCA_Rules_SHORT.txt
+# UCA_Rules_SHORT.txt
 # Copyright (C) 2016 and later: Unicode, Inc. and others.
 # License & terms of use: http://www.unicode.org/copyright.html
 # Date: 2016-06-03, 18:30:56 GMT

intl/icu/source/data/unidata/changes.txt

@@ -1,4 +1,4 @@
-* Copyright (C) 2016 and later: Unicode, Inc. and others.
+* Copyright (C) 2016 and later: Unicode, Inc. and others.
 * License & terms of use: http://www.unicode.org/copyright.html
 * Copyright (C) 2004-2016, International Business Machines
 * Corporation and others.  All Rights Reserved.

intl/icu/source/data/unidata/confusables.txt

@@ -1,4 +1,4 @@
-# confusables.txt
+# confusables.txt
 # Date: 2016-04-05, 11:47:12 GMT
 # Copyright (C) 2016 and later: Unicode, Inc. and others.
 # License & terms of use: http://www.unicode.org/copyright.html

intl/icu/source/data/unidata/confusablesWholeScript.txt

@@ -1,4 +1,4 @@
-# Summary: Whole-Script Confusables
+# Summary: Whole-Script Confusables
 # File: confusablesWholeScript.txt
 # Version: 8.0.0
 # Generated: 2015-05-17, 03:09:04 GMT