Improve categorization of ticker

[StephanAkkerman]

The current approach seems a bit too API-heavy. Maybe we can change it so that we use a static list of NASDAQ tickers and some popular crypto tickers to categorize it.

Ideas:

• Save more data, for instance anything for classifying tickers we get back from yahoo finance, coingecko, TV, etc.
• The goal is to have a clear list of which tickers / names / ids are crypto and which are stocks or forex.
• Use caching (see #505 )
• Look into rotating proxies for coingecko (or another API)
• Remove forex category and merge them with stocks (there are not much tweets about forex anyways)
• Unknown tickers should always be crypto

[StephanAkkerman]

Remove charts and text channels for forex and merge them back to stocks. Nobody tweets about forex ever and it only takes time to process forex tickers seperately

[StephanAkkerman]

Always use crypto category if the ticker is unknown + scan for common tickers in tweet for instance if the tweet contains BTC / bitcoin, ETH / ethereum, altcoins etc.