[Enhancement] Add Ability to Set Aspect Ratio of Container

[jeremy-farrance]

Important: this is done and working on PDPR2023 20240319 JRF
https://pdpr2023.accuraty.us/Parks/Community-Parks/Centennial-Park

Get this done properly, export the app.xml and update the downloadable (as AccuMap 1.1)

Since the <style> uses width: 100% and then sets the aspect ratio using padding-top (e.g. a 4:3 aspect ratio is 100:75, so current default padding is 75%)

Add a new field named AspectRatio (Label: Aspect Ratio) with a default of 75 and set the Dropdown to the obvious choices:

value; label
200:1:2, Tall
100:1:1, Square
75:4:3 Standard TV (Default)
66.66:3:2 Classic Film
56.25:16:9 HD Video
42.85:21:9 Film Widescreen

Reference
1:1 (Square): padding-top: 100%;
4:3 (Standard TV): padding-top: 75%;
3:2 (Classic 35mm film): padding-top: 66.66%;
16:9 (HD Video): padding-top: 56.25%;
21:9 (Cinema / Film): padding-top: 42.85%;