* consolidated the getter functions on the game data side
* better handling of per-sprite lighting with fog
* allow negative values for additive per-sprite lighting.
* also fixed return type of UpdateWaterDepth.
Turns out that there's a few old maps that have the extended line flags set but not the guard bit that forces their clearance.
Astrostein 1's first map is an example for this.
* added handlers for the missing upper flags in the first flag word.
* refactored some code related to MF_BOUNCES to adapt to other flags' changes to avoid constant property updates for too many flags.
* treat anything with RF_ZDOOMTRANS as non-translucent for the purpose of the flag checks.
While 'block players' was just a simple remap, 'block land monsters' required quite a bit of work...
This also fixes the bug that BLOCK_FLOATERS was never checked for sliding against a wall.
