Is your feature request related to a problem? Please describe.

I strive to have a clean home directory, but there are many files related to WakaTime in ~:

• .wakatime.bdb
• .wakatime.cfg
• .wakatime.db
• .wakatime.log
• .wakatime-internal.cfg (since Seperate file for waketime.cfg/[settings] from [internal] #535)

Describe the solution you'd like to see

A lot of softwares find their configuration in $XDG_CONFIG_HOME (by default at ~/.config), which helps to have a less cluttered ~.

WakaTime could use the same convention to place the configuration files such as .wakatime.cfg in $XDG_CONFIG_HOME/wakatime (which would be ~/.config/wakatime by default), and data files such as .wakatime.db in $XDG_DATA_HOME/wakatime or $XDG_CACHE_HOME/wakatime.

Describe alternatives you've considered

Another solution would be to group them in a new directory such as ~/.wakatime.

Additional context

This feature request describes the behavior in a Unix environment, but macOS and Windows have their own conventions, even if the XDG Base Directory Specification leaks on them a little. I let you choose what suits the most for those platforms.