Feature request: ignore missing api key

[xzfc]

I am using the same neovim configuration across multiple machines. Some of them have ~/.wakatime configured, and some of them don't. On machines without wakatime configured, vim-wakatime emits the following warnings on vim open and periodically every few minutes, which is annoying.

Error detected while processing BufEnter Autocommands for "*"..function <SNR>8_InitAndHandleActivity[2]..<SNR>8_SetupConfigFile:
line   22:
[WakaTime] Type the Vim command :WakaTimeApiKey to enter your WakaTime API Key. Find yours at https://wakatime.com/api-key
Press ENTER or type command to continue

Error detected while processing function <SNR>8_NeovimAsyncExitHandler:
line    6:
[WakaTime] Error 104: Invalid API Key
Press ENTER or type command to continue

It would be convenient, if these message be less annoying. Some suggestions:

• Use echomsg instead of echoerr so the editor won't get blocked waiting for user input.
• Don't auto-emit "missing key/config" diagnostics unless asked to. E.g. provide a WakaTimeStatus command. For neovim you could use the Healthcheck framework.
• If API key is not provided, disable the plugin, so "Invalid API Key" won't get emitted every few minutes.

I believe that merely installing the plugin shouldn't force the user to use it.

[alanhamlett]

Fixed with 53bba6bb8342de9cbdafc82142a9b5e82008d858.