Mining computation update

* Added various views and helper functions used by the mining
computation but which may be re-used in other parts.

* Added mining computation update type and associated update function

* New constants: game.resources.weightBase (the value used to compute
weights from mining settings) and game.resources.extraction (the
quantity extracted in a day from a full provider at difficulty 0)

legacyworlds-server-beans-system/src/main/java/com/deepclone/lw/beans/sys/ConstantsRegistrarBean.java

@@ -61,6 +61,13 @@ public class ConstantsRegistrarBean
 		cDesc = "Resource recovery dampener. Lower means less dampening";
 		defs.add( new ConstantDefinition( "game.resources.recoveryDampening" , "Natural resources" , cDesc , 1.5 , 1.0 ,
 				true ) );
+		cDesc = "Resource weight base value. This value is taken to the Xth power to compute the actual "
+				+ "weight when determining how mining work is distributed amongst a planet's resource providers.";
+		defs.add( new ConstantDefinition( "game.resources.weightBase" , "Natural resources" , cDesc , 10.0 , 1.1 ,
+				100.0 ) );
+		cDesc = "Resources extracted per work unit, per (real) day, from a full provider with minimal difficulty.";
+		defs.add( new ConstantDefinition( "game.resources.extraction" , "Natural resources" , cDesc , 1.0 , 1.0 ,
+				true ) );
 
 		// Happiness
 		String[] hcNames = {