Make KeySpecParser case insensitive

java/res/xml-sw600dp/key_styles_common.xml

java/res/xml-sw768dp/key_styles_common.xml

java/res/xml/key_styles_common.xml

java/res/xml/key_styles_enter.xml

java/res/xml/rowkeys_georgian1.xml

java/res/xml/rowkeys_georgian2.xml

java/res/xml/rowkeys_georgian3.xml

.../android/inputmethod/keyboard/internal/KeySpecParser.java

...droid/inputmethod/keyboard/internal/KeyboardCodesSet.java

...droid/inputmethod/keyboard/internal/KeyboardIconsSet.java

...roid/inputmethod/keyboard/internal/KeyboardLabelsSet.java

tests/res/values/donottranslate.xml

.../inputmethod/keyboard/internal/KeySpecParserCsvTests.java

...oid/inputmethod/keyboard/internal/KeySpecParserTests.java

...roid/inputmethod/keyboard/internal/KeyboardLabelsSet.tmpl