Disallow printers larger than 2km

To do this, I'm giving more power to the NumericTextFieldWithUnit QML element, to allow an arbitrary minimum and maximum. Enforcing this minimum and maximum is fairly simple with a JavaScript hook. This hook is necessary because the DoubleValidator allows intermediary values which defeats the purpose, essentially allowing any number as long as it has the correct number of digits.
Printers larger than 2km would start to give overflow errors in its X and Y coordinates. Z is okay up to about 9 billion kilometres in theory, since we don't need to do any squaring math on those coordinates afaik. In practice I'm doing this because at very high values the Arranger also gives errors because Numpy can't handle those extremely big arrays (since the arranger creates a 2mm grid).

Fixes Sentry issue CURA-CB.

cura/Arranging/Arrange.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2018 Ultimaker B.V.
+# Copyright (c) 2020 Ultimaker B.V.
 # Cura is released under the terms of the LGPLv3 or higher.
 from typing import List, Optional
 
@@ -30,7 +30,7 @@ LocationSuggestion = namedtuple("LocationSuggestion", ["x", "y", "penalty_points
 class Arrange:
     build_volume = None  # type: Optional[BuildVolume]
 
-    def __init__(self, x, y, offset_x, offset_y, scale= 0.5):
+    def __init__(self, x, y, offset_x, offset_y, scale = 0.5):
         self._scale = scale  # convert input coordinates to arrange coordinates
         world_x, world_y = int(x * self._scale), int(y * self._scale)
         self._shape = (world_y, world_x)