git c1d57d6

[CHANGE]
only raise SongNotFound error on invalid channel
slightly increase icon size
move ENT:SetRadioStream call to __constructor

[FIX]
Glide helicopters creating two streams on player enter

- a553e9a: 3D audio support, control with cl_cradio_3d convar
- 86e98aa: Fix icon scaling being too strict
- 36c6292: Remove useless PLAYER vars from vehicle hooks

- cf4991b: Fix missing cl_radio local var in Stream class

- 9311c14: Fixed SetTime operations on channels failing for some songs
- 3b7430b: Moved from channels to stream instances (metatable)
- 3b7430b (cont.): Made static transition optional with ``cl_cradio_static`` convar
- 3b7430b (cont.): Added Fade In/Out methods for channels
- 3b7430b (cont.): Renamed cl_cradio_lower_on_speak convar to cl_cradio_volume_lower_on_speak

- 295d8b3: Normalized static transition sound
- bd195bf: Rewritten player speaking handler
- aa2e3ee: Replaced Class:IsValid usage with global IsValid

- d742aca: Glide plane support

- 087ff4f: Exclude seats in EntityRemoved hook
- 3cfd18a: Fixed channels/sounds not clearing on LVS vehicle destruction

- fbf8a8c: Fix channels not clearing on Glide vehicle removal

- debca0f: Better handling for Sit Anywhere seats

- d193cc8: Fixed font weight being scaled
- b1323a3: Glide compatibility
- fbf83ce: Ignore Sit Anywhere seats as they cause errors and can't be used anyways

- b38fe01: Scale elements in GUI:DoPlayNotification based on height, not width
- 12d109c: Fix covers not scaling with ScrH() in GUI:DoPlayNotification