Improve the range argument editor (#443)

* Change the range argument editor

* Improve spinboxes functionality

* Fix default values

* Only allow going outside bounds with spinboxes and adjust slider range according to that

Author: BenjaTK

addons/gaea/editor/h_range_slider.gd

@@ -0,0 +1,10 @@
+@tool
+extends "res://addons/gaea/editor/range_slider.gd"
+
+## A horizontal [RangeSlider] that goes from left ([member min_value]) to right ([member max_value]),
+## used to adjust a range by moving grabbers along a horizontal axis.
+
+
+func _init() -> void:
+	_orientation = Orientation.HORIZONTAL
+	super()

addons/gaea/editor/h_range_slider.gd.uid

@@ -0,0 +1 @@
+uid://bmc1eienmo8tp