[Windows] Make the installer UI scalable to more options

[tristanlabelle]

The Windows installer UI defines controls with absolute (X, Y) coordinates. This does not scale to having more options (as will likely be the case for Android) and adapting the UI based on which components are built or not in the installer bundle.

We need an options page UI that:

• Defines togglable features without requiring absolute coordinates for each control.
• Scales to a large number of features regardless of the size of the window, by presenting a scrollbar.
• Adapts to the packages (msi’s) that were built into the installer bundle. For example, if we don’t build the Android msi, the options page UI should not show this feature, without leaving a gap between other surrounding features.
• Preserves the hierarchical visualization, where some features are logically children of others and available only if their parent is selected.

The solution to these requirements is likely to use a tree control, but there might be alternatives.