fix(P.3.1): split_namespaced_id replaced with current-module-prefix match; v0.1.1

Pre-existing bug: split_namespaced_id used first-dot-split. For modules
with dotted IDs (e.g. lib-core.maps-test), this misclassified
'<dotted-module-id>.<tilemap-name>' as cross-lib reference.

Replaced with split_local_tilemap() that matches by exact current-
module-id prefix. Module-id can now have arbitrary dots.

Surfaced by P.3.1 reference test-module 'lib-core.maps-test' which
has a dotted module-id.

manifest.lib

@@ -1 +1 @@
-{"id":"lib-core.maps","version":"0.1.0","api_min":"0.1"}
+{"id":"lib-core.maps","version":"0.1.1","api_min":"0.1"}