Remove drop shadow from badnik explosions, give drop shadows to Metal and flickies

Adds A_SetShadowScale to set an object's shadow scale, and A_ShadowScream which combines it with A_Scream, used for badnik explosions. Also gives BCZ1 Metal Sonic and the small animals their own drop shadows.

Fixes #218 (closed) and this old report: https://mb.srb2.org/threads/badniks-dropshadows-stick-around-for-the-explosion-frames.27851/

added Enhancement label

added 1 commit

• c782e817 - Give MT_METALSONIC_RACE a drop shadow & removed unused vars.

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changed title from Remove drop shadow from badnik explosions to Remove drop shadow from badnik explosions, give drop shadows to Metal and flickies

changed the description

added small label

changed milestone to %2.2.11

merged

mentioned in commit 1cd46c22

mentioned in issue #851 (closed)