Rename C function git2r_error_check_integer_arg to git2r_arg_check_integer
Rename C function git2r_error_check_logical_arg to git2r_arg_check_logical
Rename C function git2r_error_check_note_arg to git2r_arg_check_note
Rename C function git2r_error_check_signature_arg to git2r_arg_check_signature
Rename C function git2r_error_check_string_arg to git2r_arg_check_string
Rename C function git2r_error_check_tag_arg to git2r_arg_check_tag
Rename C function git2r_error_check_tree_arg to git2r_arg_check_tree