Utils: lazy decimal import

decimal is kinda big, there is no noticable difference in performance and the import is unused by webhost's customserver

Utils.py

@@ -11,7 +11,6 @@ import io
 import collections
 import importlib
 import logging
-import decimal
 from yaml import load, load_all, dump, SafeLoader
 
 try:
@@ -507,6 +506,7 @@ def chaining_prefix(index: int, labels: typing.Tuple[str]) -> str:
 # noinspection PyPep8Naming
 def format_SI_prefix(value, power=1000, power_labels=("", "k", "M", "G", "T", "P", "E", "Z", "Y")) -> str:
     """Formats a value into a value + metric/si prefix. More info at https://en.wikipedia.org/wiki/Metric_prefix"""
+    import decimal
     n = 0
     value = decimal.Decimal(value)
     limit = power - decimal.Decimal("0.005")