Update to Unicode 10.0.0.
* lib/gen-uni-tables.c (PROP_REGIONAL_INDICATOR): New enum value.
(fill_properties): Recognize property "Regional_Indicator".
(is_property_regional_indicator): New function.
(output_properties): Also output the data for regional_indicator.
(UC_JOINING_GROUP_MALAYALAM_*): New enum values.
(fill_arabicshaping, joining_group_as_c_identifier): Recognize these
joining groups.
* lib/unictype/pr_regional_indicator.c: New file.
* modules/unictype/property-regional-indicator: New file.
* modules/unictype/property-regional-indicator-tests: New file.
* modules/unictype/property-all (Depends-on): Add
unictype/property-regional-indicator.
* lib/unictype.in.h (UC_JOINING_GROUP_MALAYALAM_*): New enum values.
* lib/unictype/joininggroup_name.h: Add the MALAYALAM_* joining groups.
* lib/unictype/joininggroup_byname.gperf: Likewise.
* lib/uniwidth/width.c (nonspacing_table_data, nonspacing_table_ind):
Update.
* tests/uniwidth/test-uc_width2.sh: Update.
* All generated files under lib/uni* and tests/uni*: Regenerate.
* tests/uniname/NameAliases.txt: Update.
* tests/uniname/UnicodeData.txt: Update.
* tests/uninorm/NormalizationTest.txt: Update.
* tests/unigbrk/GraphemeBreakTest.txt: Update.
* tests/uniwbrk/WordBreakTest.txt: Update.
* All the affected modules: Bump required libunistring version.