FIX: Double free errors causing instability and crashes in multiple situations.
CHANGE: Do not delete citycars that are over quota monthly; instead, rely on the setting of the "time_to_life" based on anticipated journey time to regulate private car/citycar numbers.
CHANGE: Players can no longer change a schedule whilst a vehicle is loading so as to evade the loading time, thereby giving rise to an exploit.
CHANGE: Menu bar icon player colors follow active player rather than just the default player (backported from Standard - Turfit)
CHANGE: Industries always demand electricty whenever they produce, not just when their output stores are less than 75% full as was formerly the case.
FIX: Alternate directions did not work for the first convoy in a line to be copied.
VERSION: Increment to 11.19
Merge branch '11.x' into 12.x

Conflicts:
	simversion.h
Merge branch '12.x' into devel-new