minor mod icon modifications

New icon for the mod
(part of a big up to come graphical update: unit cards, screenshots, videos, ...)

New unit card added (temporary work in progress) for the elite cataphract units.

The development of the mod continues! :)
As alway, this new build is 100% compatible with your savegames, 100% compatible with the vanilla/unmoded game.

Thank you very much to all of you who added suggestions and new ideas for the mod!

The changes:

- The Roman Legatus (high tier general unit) modified totally in order to reflect the more oriental and byzantine look it should have.
It now shares the armour of the cataphract, uses a spear with a small round oriental cavalry shied.
Its stats are close to the those of the roman cavalry cataphract unit (Praetorian cav. in the mod)
but slightly weaker in term of charge bonus.

- The Praetorian Cavalry unit has been modified: they now use a long lance without shield and their charge bonus has been increased.
A sword as secondary weapon has been added, and they use it after the charge in melee.

- New screenshots added for the Legatus, the Armoured Leg. and the Praetorian Cav.

New shields for the Armoured Leg. and Praetorian Cav.
- large round hellenic painted (blue/red/gold) for the infantry
- small round iberic painted or not for the cavalry

small corrections made

New update: shields and helmets reworked for "cataphract like" units
Modifications on units:
*Roman Leves replaced by Syrian Auxiliary Archer unit (no cap set, intentionally: use it with moderation especially in early game)
*Plebeans in siege battles are now replaced by auxiliary infantry units
*Tower Hexaremes (tech level IV) transport now an Armoured Legionaries cohort

*Pila's base damage greatly increased (for all factions).

data correction, nothing critical

small correction: fleet cap corrected