update libs

update syntect

update Cursive

convert spaces to tabs

fix line not allocated when scrolled further than highlighting cache heap

could not parse highlight state for previous lines because those were never allocated

minor speed improvements in EditorView

simplify

style

remove optimization comments

investigated, tried with Signal and then Rc: it makes no sense to refcount here, we need to clone here logically.

remove leftover file

remove comment from TrieState

We could, but it would not give any benefit if we returned (Option<&V>, Option<K>):
- If the caller still needs the key, he must clone it before calling next() because he may not get it back
- If the caller doesn't need the key, we would not need to return it

For types that are not Clone, we're better off wrapping them with the newtype pattern and implementing Clone for that.

tui: improve readability of bindings::editor::parse_over(), remove hyper-sensitive comment

tui: move keymap visualization from main to views

tui: implement escape sequence and key parsing without a Trie to save memory

speed up LineNumbers

ted: add num module

add CharCache::truncate_shrink_min(), speed up LineNumbers view

replace LineCache with RangeCache trait

remove unused import

fix and cache syntax highlighting state