Bugfix for Automation event handling

Fixes Issue #16 and related crashes.

Automation manager was erroneously examining irrelevant events for subscribed topics.

Exacerbated by some recent changes (improvements) in zigbee2mqtt.

Fix PostgreSQL Integer Logging

The Postgres integration was crashing or logging zeroes when it received a float64 type and was configured to expect an integer. This is a valid configuration - so in this case, the values are now rounded to the nearest integer and then logged.

AGHAST v0.5.0 - Simpler Conditions

AGHAST v0.5.0 (released 2021-08-21) - Simpler Conditions

• New Feature: Conditions may now use a value from the triggering message

AGHAST v0.4.0 - Simpler Automations

AGHAST v0.4.0 (released 2021-08-18) - Simpler Event Configuration

• WARNING: There are breaking changes to the Automation configuration files in this release.
  (Hopefully for the last time in a while.)
• Major Changes: Automation Events now simply send 'Payload' strings.

AGHAST v0.3.0

WARNING: There are breaking changes to the Automation configuration files in this release.

• Major Changes: Automation Events fields renamed to 'Key' and 'Value'.
  Unnecessary [Event] section in Automation TOML files removed.
• New Features: mqtt2smtp MQTT-to-Email Integration added.
• Bug Fixes: Issue #14 (Goroutine leak) and related bugs and races were fixed.