[Fonts] Sort material icons (#76691)

* Update update_icons.dart

* Merge and simplify identifier rewrites

* Update update_icons.dart

* Update update_icons.dart

* Update update_icons.dart

* Add newline

* remove whitespace

* Copy instead of moving

* Fix typo

* Clean up code

Introduce fullFlutterId and fix a small dartdoc bug

* Update update_icons.dart

* Implement sorting

* Remove trailing spaces

* Revert "Remove trailing spaces"

This reverts commit c198a160678f636add30966a016383657ea76972.

* Revert "Implement sorting"

This reverts commit 0fac8c1f1c8ba1ce867f5d5205e3d6f751c08a89.

* Revert "Revert "Implement sorting""

This reverts commit 0f8ec2381ac87b44f43554d267783a5cc2375172.

* Revert "Revert "Remove trailing spaces""

This reverts commit c3ef8658799e4f7aab851ff830d62ca2bb9aba94.

* xx

* add braces