Increase the health of OILB to 1000 and the amount of cash its CashTrickler brings in to 100
adds artillery_explosion

Technically unnecessary, but using self_destruct on regular weapons in weapons.yaml might be a little confusing for modders. artillery_explosion is a more straight-forward label for art-exp1.
sound and explosion changes

Explosion sounds have been noticeably absent from the RA mod, artillery weapons only used the weak kaboom12, most other weapons had no ImpactSound at all, making even larger battles sound 'empty'.

Now, explosive artillery weapons (155m, 8Inch, SubMissile) use art-exp1 as animation and kaboom22 as impact sound. Furthermore, most cannons and rockets now use kaboom12 as ImpactSound. In one or two cases kaboom15 is used instead. Furthermore, for consistency Trail: smokey was disabled on Dragon and ChronoTusk.
Merge pull request #3295 from reaperrr/patch-3

adding ImpactSounds to many weapons + other changes
validate building placement in ResolveOrder as well
fix validation of startgame order
Merge pull request #3311 from chrisforbes/placebuilding-resolve

validate building placement in ResolveOrder as well
airfield gfx improvements

- added separate idle shp to allow using all 8 frames while keeping idle/active separate.
- replaced some empty/background pixels inside tower with shadow.
silo gfx improvements

- fixed some minor errors on the undamaged frames.
- added shadow.
changes civ pistol explosion to single piff

multiple piffs from a civilian pistol shot? Looks a little strange ;)
changes light tank bullet to 50cal.shp

a better match for the low damage per shot, imo.
adjusting explosion position

- originally, frag1 was not centric and appears to the right of the impact/exploding vehicle.
- fball1 appeared quite a bit below the impact point. This moves it up a little.
Yak shp fix

Originally, the 2nd frame of yak.shp used greyscale for the tail fins instead of remap.
gap gen & mgg with shadows
crates with shadow and wood crate palette fix

- westwood never bothered converting the wood crate to RA's palette. I did.
- shadows added to both wood crate and silver crate.
construction yard with shadow

It always annoyed me that the CY had no shadow at all. This adds some at the edges.
adding myself to AUTHORS
Add capture bonus to OILB
Merge pull request #3330 from ScottNZ/balance

Oil derrick buff
Merge pull request #3320 from reaperrr/improved_visuals_v2

several visual improvements