Btrccts Versions Save

• Added python 3.12 support
• Fixed typos
• improved documentation
• fixed tests with newest ccxt and pandas version

Add python3.11 support (only tests needed to be adapted)

Fix bug when ccxtpro is avaiable, but exchange is not an ccxtpro exchange

• Add async ccxt version support
• Add ccxt.pro support

• Renamed timedelta to interval
• Fixed some bugs
• Improved documentation