Add eggdrop version check python script

[michaelortmann]

Found by: https://github.com/michaelortmann/
Patch by: https://github.com/michaelortmann/
Fixes:

One-line summary:
Add eggdrop version check python script

Additional description (if needed):
The script version checks every 24h
The other example scripts never used eggdrop.tcl.set() and threading, so this is a nice addition

Test cases demonstrating functionality (if applicable):
eggdrop.conf:

loadmodule python
pysource scripts/check_version.py

> ./eggdrop -t eggdrop.conf
[...]     
Module loaded: python          
Version check: eggdrop update found: latest v1.10.1 current v1.10.0
Loaded check_version.py