[Version-unspecific] Remove non-alphanumeric Symbol characters entirely in Bifrost
[Version-unspecific]
This is intended to close #1513
'THORChain cannot handle "+" characters in whitelisted tokens' symbols'.
I welcome in particular suggestions for how to more exhaustively replace with ""
characters which do not satisfy the regex string ^[A-Za-z0-9_]+$
(from isAlphaNumeric, but with -
and .
deliberately left out; I am also open to leaving out _
as well if preferred
(to allow through only alphanumeric characters)).