Allow disabling the cache during development

Set "devel > cache > enabled" to false in config.yaml to disable the cache. Defaults to true.

src/octoprint/server/util/flask.py

@@ -76,6 +76,11 @@ def cached(timeout=5 * 60, key=lambda: "view/%s" % flask.request.path, unless=No
 				logger.debug("Cache bypassed, calling wrapped function")
 				return f(*args, **kwargs)
 
+			# also bypass the cache if it's disabled completely
+			if not settings().getBoolean(["devel", "cache", "enabled"]):
+				logger.debug("Cache disabled, calling wrapped function")
+				return f(*args, **kwargs)
+
 			cache_key = key()
 
 			# only take the value from the cache if we are not required to refresh it from the wrapped function

src/octoprint/settings.py

@@ -237,6 +237,9 @@ default_settings = {
 	},
 	"devel": {
 		"stylesheet": "css",
+		"cache": {
+			"enabled": True
+		},
 		"virtualPrinter": {
 			"enabled": False,
 			"okAfterResend": False,