unictype: Add Emoji properties from Unicode 11.0.0.
* lib/gen-uni-tables.c (PROP_EMOJI*, PROP_EXTENDED_PICTOGRAPHIC): New
enum values.
(fill_properties): Don't require a space between the property name and
the comment. Handle the property names from emoji-data.txt.
(is_property_emoji, is_property_emoji_presentation,
is_property_emoji_modifier, is_property_emoji_modifier_base,
is_property_emoji_component, is_property_extended_pictographic): New
declarations.
(output_properties): Emit the properties emoji, emoji_presentation,
emoji_modifier, emoji_modifier_base, emoji_component,
extended_pictographic.
(get_lbp): Use the emoji_modifier property.
(main): Expect one more argument, for the emoji-data.txt file.
* lib/unictype.in.h (UC_PROPERTY_EMOJI, UC_PROPERTY_EMOJI_PRESENTATION,
UC_PROPERTY_EMOJI_MODIFIER, UC_PROPERTY_EMOJI_MODIFIER_BASE,
UC_PROPERTY_EMOJI_COMPONENT, UC_PROPERTY_EXTENDED_PICTOGRAPHIC,
uc_is_property_emoji, uc_is_property_emoji_presentation,
uc_is_property_emoji_modifier, uc_is_property_emoji_modifier_base,
uc_is_property_emoji_component, uc_is_property_extended_pictographic):
New declarations.
* lib/unictype/pr_emoji.c: New file.
* lib/unictype/pr_emoji_presentation.c: New file.
* lib/unictype/pr_emoji_modifier.c: New file.
* lib/unictype/pr_emoji_modifier_base.c: New file.
* lib/unictype/pr_emoji_component.c: New file.
* lib/unictype/pr_extended_pictographic.c: New file.
* modules/unictype/property-emoji: New file.
* modules/unictype/property-emoji-tests: New file.
* modules/unictype/property-emoji-presentation: New file.
* modules/unictype/property-emoji-presentation-tests: New file.
* modules/unictype/property-emoji-modifier: New file.
* modules/unictype/property-emoji-modifier-tests: New file.
* modules/unictype/property-emoji-modifier-base: New file.
* modules/unictype/property-emoji-modifier-base-tests: New file.
* modules/unictype/property-emoji-component: New file.
* modules/unictype/property-emoji-component-tests: New file.
* modules/unictype/property-extended-pictographic: New file.
* modules/unictype/property-extended-pictographic-tests: New file.
* modules/unictype/property-all (Depends-on): Depend on the new modules.