Texture File updates and Ceiling Sentinels

Some extra changes in cvs:

a) Combined all the Druid Texture and Mesh files (not the DCMonster ones). This is basically a tidying up exercise. We now have:

DCText.utx - combines DCTextures, DruidEngTextures, dcEngTex, DruidsRPGShaders1, and adds new textures.
So DCTextures.utx, DruidEngTextures.utx, dcEngTex.utx, DruidsRPGShaders1.utx are no longer required.

DCStatic.usx - combines dcBlocksMesh, DruidEngStatics, DCStatics, and adds some new static meshes.
So dcBlocksMesh.usx, DruidEngStatics.usx, DCStatics.usx are no longer required.

DCMesh.ukx - replaces dcBlocksMeshes
So dcBlocksMeshes.ukx is no longer required.

Lots of files updated to reference the new texture files.

b) Added 3 new sentinels. These are all variants of the lightning, defense and normal sentinel that attach to the ceiling rather than the floor. So they shouldn't get in the way as much. Cost and damage exactly the same.

c) You can now only spawn sentinels and turrets on surfaces which are world geometry - so no more trying to perch sentinels on top of vehicles.

d) Icons updated for RemoteInv, RemoteMax and RemoteDamage to distinguish them

e) Icons for "Kill all summoned...." artifacts changed to distinguish the kills from the summons.

f) New icon added for summon block artifacts - used to use the pet icon

g) Defense sentinels now shoot green bolts to take out missiles, to distinguish them from other bolts. Defense sentinel color changed to green to match.

h) Engineer link gun overlay color changed from the infinity red color to a new yellow color, to distinguish it.

i) Updated RPG.ini file in cvs to add extra sentinels to configuration

Sentinels and Ceiling sentinels now rotate to target the enemy. In cvs.
Does not apply to lightning or defense sentinels as they are multi-directional.