Avoid usage of forEach on ranges.

[JedS6391]

There are a few places where the following syntax is used in the system:

(0..n).forEach {
    // Do something
}

According to this article, forEach is 300% slower than a for-loop and should be avoided.

A grep on the source code identified the following occurrences:

src//main/kotlin/lgp/core/evolution/operators/SelectionOperator.kt:    (0..tournamentSize - 2).forEach { _ ->
src/main/kotlin/lgp/core/evolution/model/Models.kt:                    (0 until this.environment.configuration.generations).forEach { gen ->
src/main/kotlin/lgp/core/evolution/model/Models.kt:                    (0 until this.environment.configuration.generations).forEach { gen ->
src/main/kotlin/lgp/core/evolution/model/Models.kt:                    (0 until numGenerations).forEach { _ ->
src/main/kotlin/lgp/core/evolution/model/Models.kt:                    (0 until this@IslandMigration.options.migrationSize).forEach { _ ->
src/main/kotlin/lgp/core/program/registers/RegisterSet.kt:             (0 until this.totalRegisters).forEach { r ->