Introduces ReloadModifier
and renames ROF -> ReloadDelay
ReloadModifier & ROF -> ReloadDelay yaml changes
Upgrade rule for ROF > ReloadDelay renaming.
Adds length display support for PCM & IMA music.
Merge pull request #6089 from reaperrr/wavlength

Add WavSoundLength to show track length in music player
Merge pull request #6079 from reaperrr/rof-modifier

Adds ReloadDelay modifier & renames ROF to ReloadDelay
Moved ConvertSpriteToPng command to RA assembly.

Added IUtilityCommand allowing mods to add commands.
Moved the --png command to the RA mod assembly.
Maintaining backwards compatibility.
Moved all utility commands into RA mod assembly.