ch32v003fun_libs

Various single file libraries for the ch32v003fun project:

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1. ch32v003_i2c.h - basic i2c library using polling or interrupt (default) mode. Does not cover all i2c features, but it's a good starting point.
2. ch32v003_uart.h - basic uart library, interrupt based and with buffered TX, RX.
3. utils.h - various useful utility functions as itoa, printBin, FastMultiply (by CNLohr).
4. vt100.h - ANSI codes to make the print output more colorful.