Support a maximum building range (Fixes #2156).

This also implements support for a per-provider
cooldown between placing structures, allowing mods
with multiple structure queues to rate-limit
placement around a single provider.

An initial delay parameter is included to
support units that deploy into a base provider and
require an initial setup time (e.g. the Surveyor
unit from C&C TW).

The range and time restrictions are not applied to
walls as a balance choice.

mods/cnc/rules/structures.yaml

@@ -45,6 +45,8 @@ FACT:
 		ReadyAudio: ConstructionComplete
 	BaseBuilding:
 	ProductionBar:
+	BaseProvider:
+		Cooldown: 200
 
 NUKE:
 	Inherits: ^Building