Increased user friendliness

Added default MLST scheme
Added multiple ways of defining a MLST scheme
CSV output now shows database name for each scheme ID
Now uses native argparse library for ensuring mutual exclusivity of arguments and whether or not one is required.
Updated to use 0.13.* of engine

.devcontainer/devcontainer.json

@@ -12,7 +12,7 @@
 	// "forwardPorts": [],
 
 	// Use 'postCreateCommand' to run commands after the container is created.
-	"postCreateCommand": "pip3 install --user -r requirements.txt && pip install -e .",
+	"postCreateCommand": "pip3 install --user -r requirements.txt --pre && pip install -e .",
 	"customizations": {
 		"vscode": {
 			"extensions": [