Fix remaining clint errors and remove error suppression completely.

Rename the lint targets to align with the established naming convention:

- lintc-clint lints with clint.py.
- lintc-uncrustify lints with uncrustify.
- lintc runs both targets.

lintc is also provided as a make target for convenience.

After this change we can remove these files:
https://github.com/neovim/doc/tree/gh-pages/reports/clint
https://github.com/neovim/doc/blob/main/ci/clint-errors.sh

It's confusing to mix vendored dependencies with neovim source code. A
clean separation is simpler to keep track of and simpler to document.

Note for external UIs: Nvim can now emit multiple "redraw" event batches
before a final "flush" event is received. To retain existing behavior,
clients should make sure to update visible state at an explicit "flush"
event, not just the end of a "redraw" batch of event.

* Get rid of copy_object() blizzard in the auto-generated ui_event layer
* Special case "grid_line" by encoding screen state directly to
  msgpack events with no intermediate API events.
* Get rid of the arcane notion of referring to the screen as the "shell"
* Array and Dictionary are kvec_t:s, so define them as such.
* Allow kvec_t:s, such as Arrays and Dictionaries, to be allocated with
  a predetermined size within an arena.
* Eliminate redundant capacity checking when filling such kvec_t:s
  with values.

Co-authored-by: Björn Linse <bjorn.linse@gmail.com>

Add space around arithmetic operators '+' and '-'.
Remove space between back-to-back parentheses, i.e. ')(' vs. ') ('.
Remove space between '((' or '))' of control statements.
Add space between ')' and '{' of control statements.
Remove space between function name and '(' on function declaration.
Collapse empty blocks between '{' and '}'.
Remove newline at the end of the file.
Remove newline between 'enum' and '{'.
Remove newline between '}' and ')' in a function invocation.
Remove newline between '}' and 'while' of 'do' statement.

Co-authored-by: Brede Yabo Sherling Kristensen <bredeyabo@hotmail.com>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Co-authored-by: István Donkó <istvan.donko@gmail.com>
Co-authored-by: Julian Berman <Julian@GrayVines.com>
Co-authored-by: bryant <bryant@users.noreply.github.com>
Co-authored-by: Michael Lingelbach <m.j.lbach@gmail.com>
Co-authored-by: nlueb <9465658+nlueb@users.noreply.github.com>
Co-authored-by: Leonhard Saam <leonhard.saam@yahoo.com>
Co-authored-by: Jesse Wertheim <jaawerth@gmail.com>
Co-authored-by: dm1try <me@dmitry.it>
Co-authored-by: Jakub Łuczyński <doubleloop@o2.pl>
Co-authored-by: Louis Lebrault <louis.lebrault@gmail.com>
Co-authored-by: Brede Yabo Sherling Kristensen <bredeyabo@hotmail.com>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Co-authored-by: István Donkó <istvan.donko@gmail.com>
Co-authored-by: Julian Berman <Julian@GrayVines.com>
Co-authored-by: bryant <bryant@users.noreply.github.com>
Co-authored-by: Michael Lingelbach <m.j.lbach@gmail.com>
Co-authored-by: nlueb <9465658+nlueb@users.noreply.github.com>
Co-authored-by: Leonhard Saam <leonhard.saam@yahoo.com>
Co-authored-by: Jesse Wertheim <jaawerth@gmail.com>
Co-authored-by: dm1try <me@dmitry.it>
Co-authored-by: Jakub Łuczyński <doubleloop@o2.pl>
Co-authored-by: Louis Lebrault <louis.lebrault@gmail.com>

* sp_enum_after_assign = force
* sp_brace_typedef = force
* nl_do_brace = remove
* sp_do_brace_open = force
* sp_brace_close_while = force
* sp_before_semi = remove
* sp_before_semi_for = remove
* sp_before_semi_for_empty = remove
* sp_between_semi_for_empty = remove
* sp_after_semi_for_empty = remove
* sp_before_square = remove
* sp_before_squares = remove
* sp_inside_square = remove
* sp_inside_fparens = remove
* sp_inside_fparen = remove
* sp_inside_tparen = remove
* sp_after_tparen_close = remove
* sp_return_paren = force
* pos_bool = lead
* sp_pp_concat = remove
* sp_pp_stringify = remove
* fixup: disable formatting for the INIT section

* refactor: general good option changes
  sp_deref = remove
  sp_not = remove
  sp_inv = remove
  sp_inside_paren_cast = remove
  mod_remove_duplicate_include = true
  sp_after_semi = add
  sp_after_semi_for = force
  sp_sizeof_paren = remove
  nl_return_expr = remove
  nl_else_brace = remove
  nl_else_if = remove
* refactor: mod_remove_extra_semicolon = true
* refactor: nl_max = 3
* refactor: sp_bool = force
* refactor: sp_compare = force
* refactor: sp_inside_paren = remove
* refactor: sp_paren_paren = remove
* refactor: sp_inside_sparen = remove
* refactor: sp_before_sparen = force
* refactor: sp_sign = remove
* refactor: sp_addr = remove
* refactor: sp_member = remove
* refactor: nl_struct_brace = remove
* refactor: nl_before_if_closing_paren = remove
* refactor: nl_fdef_brace = force
* refactor: sp_paren_comma = force
* refactor: mod_full_brace_do = add