Slight DSP volume adjustments.

Added legacy mode which uses the old sound processing. Toggle with ere_legacy_mode 0/1.

Fixed wrong cheap mode trace reduction.

Slightly more distinction between cramped and small presets.

Woops forgot to update some parts.

Better sound processing. Effects should no longer feel muffled and surround sound now works properly when an effect is active.

Added cheap modes which can be activated using ere_cheap_mode. Use it if your hardware is struggling. Mode 1 removes some diagonal traces, while mode 2 uses only up and down traces. Be warned, spatial accuracy takes a huge hit in mode 2.

Fixed a bug where the reverb wouldn't turn off if ere_active is set to 0 in a multiplayer session.

Fixed a bug where the echo/reverb preset would be resolved as indoors when driving a vehicle.

Fixed DSP allocation error caused by setting room_type to 0 for indoors presets.