Supply-Gated Town Growth

In the base game a town keeps growing as long as some of its needs are met: good bus service or one well-supplied cargo is enough, even when everything else it asks for never arrives. With this mod a town only grows, and only reaches its next level, while every need is supplied. Once a month every town is checked. If any cargo it needs, in any district, or its passenger service (how many residents travel on your lines) is supplied below the chosen share of its demand (70 % by default), the town gets 2 months to fix it. Its town window lists what is short and how much time is left, and towns you serve get an icon at their name on the map. If the shortage lasts longer, the town's development is paused: it earns no experience, does not level up and does not expand. As soon as everything is supplied again, it resumes. A cargo only counts if some industry on your map can make it, so a town is never held back by a cargo you cannot get. Noise, pollution, traffic, happiness, delivery and reputation keep working as in the base game: poor ratings slow a town down, and Very Poor stops it. Settings: - Supply needed to grow: from 100 % down to 20 % of the demand of each need (70 % by default). Lower shares make big cities easier to keep growing. - Needs allowed to be short: none (default), 1 or 2 cargo or passenger needs may be short while a town still grows normally. - Time to fix a shortage: 2 months, 1 month, none or 4 months before a town pauses. - When a shortage lasts: stop developing (default), or develop slowly, so one missing cargo slows a town down instead of stopping it. The icon stays yellow while a town grows slowly. - Slow growth speed (only used with "Develop slowly"): at most 10 %, 25 % (default) or 50 % of the time, lower with every need that is short. At 25 %, a town with two of three needs met develops about 1 month in 6. Between its growth months the town window shows "Town Development Inactive"; that is expected. - Passenger service: the same share as cargo (default), a passenger rating of Good or of Very Good or better, or ignored. - Town ratings needed to grow: base game rules (default), or stricter: no red (Mediocre or better) or all green (Very Good or better) before a town may grow. - Notifications: the town window of every town that is short or has stopped developing says what it needs and how much time is left; towns you serve also get an icon at their name on the map. No pop-ups. - Resume all towns: switches every town the mod paused back on. Load your save once with this setting before removing the mod; otherwise those towns stay paused. When a town levels up it asks for a new cargo, which starts unsupplied: deliver it within the grace time, or the town pauses until you do. While a town is paused the town window does not update its ratings and warnings; they catch up when it resumes. Towns that were paused by something else are left alone. Pairs well with Town Cargo Need Levels (https://mod.io/g/transportfever3/m/town-cargo-need-levels), which sets the town levels at which towns ask for new cargo and how many cargo needs they end up with: later or fewer needs mean towns are paused less often. Changes - Revision 6: fixed paused towns growing anyway since revision 5 (the ratings refresh for paused towns let the town builder run). That refresh is removed: ratings and warnings of a paused town update again when it resumes, and its note in the town window says so. - Revision 5: new setting "Needs allowed to be short" (None / 1 / 2): a town keeps growing normally with that many needs short. Slowly growing towns show when their next growth month is. - Revision 4: subsidy rewards now reach towns that are paused or growing slowly (before, the game dropped them while development was off). - Revision 3: "Develop slowly" keeps a town growing when a cargo is missing; its speed depends on how well all its needs are met (before, one missing cargo stopped it). New setting "Slow growth speed" (10 / 25 / 50 %, default 25 %). Slowly growing towns get a yellow icon, red only when stopped. Shorter notes in the town window. - Revision 2: supply options down to 20 %; defaults are 70 % for cargo and the same share for passengers. - Revision 1: first release.