faster SRCINFO parsing + memory-based building

Switched to parsing srcinfo with channels on all available cpus, speeding
up srcinfo-parsing and queue generation by a lot.

New memory-limit based building will max out the available memory while
not building the same packages at the same time for different marchs,
fixing some long-standing bugs like firefox not building at the same time
because the same ports are used for profile-based optimization. This
also drops the artificial delay on build-start, speeding up things even
more. This also means there is no hard-coded limit on how many packages
can be build at once anymore. As long as there is RAM available, builds will be
started.

ent/dbpackage.go

@@ -9,7 +9,7 @@ import (
 	"time"
 
 	"entgo.io/ent/dialect/sql"
-	"git.harting.dev/ALHP/ALHP.GO/ent/dbpackage"
+	"somegit.dev/ALHP/ALHP.GO/ent/dbpackage"
 )
 
 // DbPackage is the model entity for the DbPackage schema.
@@ -359,9 +359,3 @@ func (dp *DbPackage) String() string {
 
 // DbPackages is a parsable slice of DbPackage.
 type DbPackages []*DbPackage
-
-func (dp DbPackages) config(cfg config) {
-	for _i := range dp {
-		dp[_i].config = cfg
-	}
-}