[STATUS] double check for server and client vars tables to exist before attempting to create them

This should fix an issue mentioned in #126
[STATUS] use the correct data type for 'Updated' column

This should fix an issue mentioned in #126
[STATUS] enforce database tables drop->create so we do not have to bother with schema updates
[STATUS] minor fixes + updated plugin version: 1.4.18
Merge pull request #172 from FenixXx/release-1.10

[STATUS] Major fixes to database related code