Refactor waiting_proc and waiting_operator_proc

[tompng]

Fixes #605

waiting_proc

Most waiting_proc will be cancelled when ARROW keys (and other symbol key) is pressed, but Reline did not implement cancel

# Method that uses waiting_proc and cancel when ARROW is pressed
incremental_search_history
vi_replace_char
vi_next_char
vi_to_next_char
vi_prev_char
vi_to_prev_char
# Exceptional case that readline inserts escape sequence when ARROW is pressed
ed_quoted_insert

Fixes except ed_quoted_insert.

waiting_operator_proc

Vi mode's waiting_operator_proc was complex.

c: vi_change_meta
d: vi_delete_meta
y: vi_yank

Reline's problem with waiting_operator

• df_ does not terminate delete_meta
• dd should clear line
• cc should clear line
• dc dy cd cy yd yc yy should cancel waiting_operator
• For 3d5h, 5 should be used as @vi_arg but Reline does not
• ARROW key should cancel waiting_operator

Fixes all of them.