* Add more symbols to accent_syperscript
* Add all uppercase and lowercase variants to accent_small_caps
* Use ʁ instead of ᴚ in accent_small_caps

* Update cdict

* scripts/subst_of_compose.py: Compute substitutions

from compose mappings. They are used when building dictionaries.

* Add substitutions compose data

* Better suggestion with diacritics

This improves the suggestions for words that contain diacritics and
uppercase letters.

This works by stripping diacritics both when building the dictionaries
(using word aliases added in cdict: https://github.com/Julow/cdict/pull/3)
and during lookup. Cdict then takes care of resolving the correct word.

The substitutions are generated using mappings from `fn`, `shift` and
all the `accent_*` modifiers into srcs/compose/substitutions.json
This can be updated easily when more mappings are added.

* Add the small capital letters dead key

It can be added to the keyboard from the settings or into custom layouts
as `accent_small_caps`.

Add all the symbols listed on https://en.wikipedia.org/wiki/Small_caps

Missing from previous commit.

* add majuscules to compose
* add tse to compose
* added reverse ya FN to modernize it FROM the older form
* fix accent FN and add reverse arabic-heh FN
* little improvements and additions
* QoL improvements for Kurdish Sorani

compile.py is changed to report when compose+Upper+Upper exists but
compse+Upper+Lower do not.

With these findings, many sequences are added.