Keycap emoji consistency. Give 1-9 :keycap-*: aliases

Currently :keycap_ten: is the only discord emoji that can be accessed by typing `keycap`, but there are 1-9 and hash keycaps that are valid as well. The following should be added as aliases

• :keycap_one:
• :keycap_two:
• :keycap_three:
• :keycap_four:
• :keycap_five:
• :keycap_six:
• :keycap_seven:
• :keycap_eight:
• :keycap_nine:
• :keycap_hash: