Update pricing approach to query dora as a fallback

[lllwvlvwlll]

Crypto compare occasionally fails. This enhancement will update our query logic to use the Dora pricing API as a fallback.

[hal0x2328]

The caching endpoint is finished and can be queried in the same manner as the CryptoCompare API, e.g.
http://54.227.25.52:8090/data/pricemultifull?fsyms=%00,ACAT,APH,APT,ASA,AVALA,BCS,BDN,CGAS,CGE,SWTH%20(OLD),CGL,CNEO,COUP,CPX,DAD,DBC,EDS,EFX,EPN,EXT,FLM,FTW,FTX,GALA,GDM,GTA,GUARD,IAM,JWT,LRN,LX,MCT,MRG,MRW,NEX,NKN,NNC,NNN,NOS,NRVE,NVL,NVM,OBT,ONT,PEGCNY,PEGUSD,PHX,PKC,PROQ,QLC,RCPT,RHT,RPX,SCC,SDS,SDT,SENNO,SGAS,SGT,SOUL*,SPOT,SWH,THOR,TKY,TMN,TNC,BRDG,UTD,WANDN,WHT,WWB,XQT,XQTA,YEZ,LFX,ZPT,SWTH,DBC,RPX,QLC,NEO,GAS&tsyms=USD