Dynamic icon positon depending on ui-scale

[Masgalor]

This PR aims to change the position of the main button/icon according to the used ui-scale.
Nothing will be scaled or otherwise resized, all this PR does is recalculating the position.

What needs to happen to move the button/icon and the clickable are.

• The left- and the right-margin must be changed.

  Burrito/Spatial.tscn

  Lines 74 to 75 in a344bdf

  	margin_left = 323.0
  	margin_right = 349.0

• The function set_minimal_mouse_block() must be called once after changing the margins.

  Burrito/Spatial.gd

  Line 121 in a344bdf

  func set_minimal_mouse_block():

How to calculate the margins.

Every button has a fixed width depending on the ui-scale.
If we know the width of one button we can calculate the margin of every n..th button.
So we can preset the button width for every scale, we can also preset the desired position of our button. (e.g. if the native ui has 10 buttons we want to be on position 11.)
After reading the ui-scale from the link, it can be used to select the appropriate base width and calculate the final position.

Possible conflicts.

When the function set_minimal_mouse_block() is called, the clickable area of all open windows will be deleted.
So the user will see the windows but can no longer interact with them.

[AsherGlick]

Once you have implemented everything you want to with this, are happy with the functionality, and convert this from a draft pr to a regular pr, then we will review this. It might take some time before we get to it, depending on our personal schedules and free cycles, but we are aware of it.