Feature/panelview space

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Issue

The Panel had a couple of issues:

1. When dragging we adjusted the position of the Panel. This caused that not all Mensas/Study Rooms we’re visible.
2. Sometimes it was possible to drag the Panel above the TabBar which would irritate user and would not allow to scroll inside the ScrollingView.

This fixes the following issue(s):
In order to fix these issues, I decided to redesign the hole Panel. First, instead of changing its position, now the panel is attached to the bottom (i.e. the TabBar) and by dragging the Panel the user changes its height. By changing this all Mensas/Study Rooms are now visible and the panel could never be dragged above the TabBar.

Screenshots

Issues
First Issue:

Simulator.Screen.Recording.-.iPhone.12.-.2022-07-22.at.08.47.42.mp4

Second Issue:

RPReplay_Final1658472764.MOV

See that the Panel is postion adjusted

Now the solution:

IMPORTANT NOTE:
Due to a suspected SwiftUI bug with the drag gesture to adjust the height and the scrolling of the ScrollView, I decided to add another Rectangle() which has the .gesture() attached instead of the PanelContentView()

See the suspected SwiftUI bug in another DemoApp:

180417073-f2ceaf1d-fbb1-4634-a579-ef457b229e72.mov

Project files of DemoApp:
DragGestureScrollView.zip

See the Rectangle() which is stacked on top of the Panel and will be moved in sycn with the Panel so stick to the top of the panel and has a Spacer() (panelHeight-dragAreaHeight) underneath it.