Resolve "Generate Schedule"

• Adds latencies to ports and methods for interacting with them to operation
• Adds Schema class and construction with ASAP scheduling

Closes #30 (closed)

b_asic/__init__.py

@@ -10,3 +10,4 @@ from b_asic.signal_flow_graph import *
 from b_asic.signal import *
 from b_asic.simulation import *
 from b_asic.special_operations import *
+from b_asic.schema import *