[MOD 0.14.*] Personal defense upgrades

[orzelek]

• Name: Personal defense upgrades
• Version: 0.0.1
• Factorio-Version: 0.14.8 (should work on any 0.14)
• Description: New tech line for upgrading personal defenses.
• License: MIT
• Release: 2016-09-25

Small test mod to check how personal defenses can be upgraded. Needs more testing to validate it actually works
When used with bob's mods it will affect all the personal defenses and vehicle turrets.

Uses laser research icons for now. Upgrade values to be revised - for now they are same as laser turrets (defenses are very similar to those).

Known issue:
It seems that upgrades menu doesn't show that upgrades are present.