support "unmap 0-9"

• fix some bugs in v1.98.1 and v1.98.2
  • fix a scrolling target might change unexpectedly on a second scroll*
  • Vomnibar: fix broken Ctrl+C on Firefox when the input box is focused
  • fix VisualMode may fail to init
  • fix broken mapKey xxx <v-xxx>
• VisualMode: fix as and ap didn't work
• fix a bug of losing nested parameters in run key xxx
• now unmap + 0~9/- will make such keys passed by default
  • and unmap 0 will make a following map 0 xxx valid