PR#11 improvment proposal

[JasonGantner]

Hello,

I'd like to propose these changes to your artizirk#11 PR.

They include:

• searching for the config file only when starting wdisplays
• handling of environment variables to locate the config file
• replacing nested loops with a single loop and fsm-like conditions
• reusing HEADS_MAX instead of defining MAX_MONITOR_NUM
• resolving some minor deprecation warnings in unrelated files
• renaming some functions to adhere to the implicit naming convention of wd_*

What's still missing (IIRC):

• a detailed explanation in CHANGELOG.md
• documentation of the new usable env vars and setting(s)

I plan on forking the main repo to try and maintain wdisplays since it seems abandoned at the moment. I need to delete my current fork in order to do that and start on a sane base.

I'll answer any questions about the proposed changes you'd need me to.

Regards,

PS: I find that the diff is easier to look at with git diff -w --word-diff d5f0e48443c8aac4357cd411b03f143f23df30ac